Revenue - Schedule of Revenue by Market (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation Of Revenue [Line Items]
Consolidated Net Sales	$ 295.8	$ 286.9	$ 378.7	$ 541.0	$ 564.3	$ 572.5	$ 609.0	$ 609.9	$ 1,502.4	$ 2,355.7	$ 2,189.1
Commercial Aerospace
Disaggregation Of Revenue [Line Items]
Consolidated Net Sales									822.3	1,597.7	1,525.0
Space & Defense
Disaggregation Of Revenue [Line Items]
Consolidated Net Sales									448.5	444.7	369.9
Industrial
Disaggregation Of Revenue [Line Items]
Consolidated Net Sales									$ 231.6	$ 313.3	$ 294.2