Income Taxes Reconciliation of Unrecognized Tax Benefits (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
Reconciliation of Unrecognized Tax Benefits [Line Items]
Balance at beginning of period	$ 20.1	$ 12.5	$ 14.0	$ 12.7
Additions for current year tax positions	0.0	0.8	2.2	1.8
Additions (reductions) for prior year tax positions	7.6	0.5	0.3	0.0
Reductions for settlements with tax authorities	0.0	(0.1)	0.0	(0.5)
Balance at end of period	$ 12.5	$ 12.7	$ 16.5	$ 14.0