Income Taxes Income Tax Provision (Benefit) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Apr. 01, 2017	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Current:
U.S. federal	$ (3.1)	$ (101.4)	$ (21.5)	$ (46.8)
Non-U.S.	8.3	40.4	28.4	29.8
State	(6.7)	(0.4)	(0.3)	(0.1)
Total current	(1.5)	(61.4)	6.6	(17.1)
Deferred:
U.S. federal	(101.0)	(85.1)	20.3	30.4
Non-U.S.	(160.4)	(14.5)	19.3	5.7
State	(0.9)	0.0	(0.2)	(0.6)
Total deferred	(262.3)	(99.6)	39.4	35.5
Total income tax provision (benefit)	$ (263.8)	$ (161.0)	$ 46.0	$ 18.4