Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Principles of Consolidation - Balance Sheet (Details)

v3.10.0.1
Basis of Presentation and Principles of Consolidation - Balance Sheet (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Current assets:        
Cash and cash equivalents $ 91.1 $ 59.0 $ 83.9 $ 88.2
Accounts receivable 197.0 197.8    
Inventories 235.9 208.1    
Prepaid expenses and other current assets 9.4 11.7    
Income tax receivable 0.0 3.6    
Total current assets 533.4 480.2    
Property, Plant and Equipment, Net 142.1 142.9    
Goodwill 4.5 4.5    
Intangible assets, net 1.8 2.0    
Deferred income taxes 14.5 16.1    
Other noncurrent assets 5.8 6.5    
Total assets 702.1 652.2    
Current liabilities:        
Current portion of debt 5.0 5.0    
Accounts payable 138.8 117.1    
Accrued liabilities 30.6 36.0    
Accrued interest 0.2 0.2    
Income tax payable 1.3 0.5    
Total current liabilities 175.9 158.8    
Noncurrent portion of debt 307.1 309.0    
Other noncurrent liabilities 37.9 37.1    
Total liabilities 520.9 504.9    
Global Brass and Copper Holdings, Inc. stockholders’ equity:        
Common stock 0.2 0.2    
Additional paid-in capital 58.3 54.5    
Retained earnings 131.5 97.3    
Treasury Stock, Value (10.0) (6.6)    
Accumulated other comprehensive loss (3.7) (2.9)    
Total Global Brass and Copper Holdings, Inc. stockholders’ equity 176.3 142.5    
Noncontrolling interest 4.9 4.8    
Total equity 181.2 147.3 128.1 95.2
Total liabilities and equity 702.1 652.2    
Accounts receivable, allowance $ 1.0 $ 1.0    
Common stock, shares issued 22,515,822 22,133,764    
Treasury stock, shares 341,678 226,576    
Previously Reported [Member]        
Current assets:        
Cash and cash equivalents   $ 59.0 83.9 88.2
Accounts receivable   197.9    
Inventories   208.1    
Prepaid expenses and other current assets   33.3    
Income tax receivable   3.6    
Total current assets   501.9    
Property, Plant and Equipment, Net   142.9    
Goodwill   4.5    
Intangible assets, net   2.0    
Deferred income taxes   16.1    
Other noncurrent assets   6.5    
Total assets   673.9    
Current liabilities:        
Current portion of debt   5.0    
Accounts payable   117.1    
Accrued liabilities   57.9    
Accrued interest   0.2    
Income tax payable   0.5    
Total current liabilities   180.7    
Noncurrent portion of debt   309.0    
Other noncurrent liabilities   37.1    
Total liabilities   526.8    
Global Brass and Copper Holdings, Inc. stockholders’ equity:        
Common stock   0.2    
Additional paid-in capital   54.5    
Retained earnings   97.1    
Treasury Stock, Value   (6.6)    
Accumulated other comprehensive loss   (2.9)    
Total Global Brass and Copper Holdings, Inc. stockholders’ equity   142.3    
Noncontrolling interest   4.8    
Total equity   147.1   $ 95.2
Total liabilities and equity   673.9    
Accounts receivable, allowance   $ 1.0    
Common stock, shares issued   22,133,764    
Treasury stock, shares   226,576    
Restatement Adjustment [Member] | Accounting Standards Update 2014-09 [Member]        
Current assets:        
Cash and cash equivalents   $ 0.0 $ 0.0  
Accounts receivable   (0.1)    
Inventories   0.0    
Prepaid expenses and other current assets   (21.6)    
Total current assets   (21.7)    
Property, Plant and Equipment, Net   0.0    
Total assets   (21.7)    
Current liabilities:        
Accrued liabilities   (21.9)    
Total current liabilities   (21.9)    
Total liabilities   (21.9)    
Global Brass and Copper Holdings, Inc. stockholders’ equity:        
Retained earnings   0.2    
Total Global Brass and Copper Holdings, Inc. stockholders’ equity   0.2    
Total equity   0.2    
Total liabilities and equity   (21.7)    
Accounts receivable, allowance   $ 0.0    
Common stock, shares issued   0    
Treasury stock, shares   0