Annual report pursuant to Section 13 and 15(d)

Revenue (Details)

v3.10.0.1
Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disaggregation of Revenue [Line Items]                      
Revenues $ 404.3 $ 429.9 $ 459.4 $ 471.8 $ 424.9 $ 359.4 $ 374.8 $ 419.5 $ 1,765.4 $ 1,578.6 $ 1,338.3
Contract with customer, liability, revenue recognized                 0.4 0.0 0.0
Building and Housing [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenues                 585.8 494.0 413.3
Automotive and Transportation [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenues                 339.1 309.4 274.1
Munitions [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenues                 185.0 190.3 142.3
Coinage [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenues                 168.3 155.6 131.6
Industrial Machinery and Equipment [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenues                 146.4 140.3 118.2
Electronic/Electrical Components [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenues                 146.0 135.5 126.4
Other Products and Services [Member]                      
Disaggregation of Revenue [Line Items]                      
Revenues                 194.8 153.5 $ 132.4
Accrued Liabilities [Member]                      
Disaggregation of Revenue [Line Items]                      
Customer advances, current $ 0.0       $ 0.4       $ 0.0 $ 0.4