Annual report pursuant to Section 13 and 15(d)

Segment Information - Information by Reportable Segment (Details)

v3.10.0.1
Segment Information - Information by Reportable Segment (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]          
Depreciation and amortization     $ 21.5 $ 18.6 $ 14.9
LIFO liquidation (loss)/gain $ (0.1) $ (1.0) (0.1) (1.0) (1.9)
Interest expense, net     16.8 17.6 26.2
Capital expenditures     26.2 24.7 34.4
Total assets 691.0 652.2 691.0 652.2  
Operating Segments [Member] | Olin Brass [Member]          
Segment Reporting Information [Line Items]          
Depreciation and amortization     11.4 10.8 9.2
LIFO liquidation (loss)/gain     (0.2) (1.0) (1.6)
Interest expense, net     0.1 0.3 0.3
Capital expenditures     12.3 13.5 15.1
Total assets 242.0 263.2 242.0 263.2  
Operating Segments [Member] | Chase Brass [Member]          
Segment Reporting Information [Line Items]          
Depreciation and amortization     6.2 5.7 4.9
LIFO liquidation (loss)/gain     0.0 0.0 (0.3)
Capital expenditures     9.2 6.7 10.0
Total assets 134.4 142.9 134.4 142.9  
Operating Segments [Member] | A.J. Oster [Member]          
Segment Reporting Information [Line Items]          
Depreciation and amortization     3.8 2.0 0.5
LIFO liquidation (loss)/gain     0.1 0.0 0.1
Interest expense, net     0.1 0.0 0.0
Capital expenditures     3.6 4.3 9.3
Total assets 178.3 171.9 178.3 171.9  
Corporate [Member]          
Segment Reporting Information [Line Items]          
Depreciation and amortization     0.1 0.1 0.3
LIFO liquidation (loss)/gain     0.0 0.0 (0.1)
Interest expense, net     16.6 17.3 25.9
Capital expenditures     1.1 0.2 $ 0.0
Total assets $ 136.3 $ 74.2 $ 136.3 $ 74.2