Income Tax Net Deferred Tax Assets and Liabilities Components (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Loss Carryforwards [Line Items]
Deferred Income Tax Expense (Benefit)	$ 106.2	$ 108.5	$ 214.1
Domestic net non-current deferred tax liabilities	1,542.8	1,488.5
Foreign net non-current deferred tax assets	105.7	34.8
Foreign net non-current deferred tax liabilities	696.8	701.7
Net non-current deferred tax liabilities	$ 2,133.9	$ 2,155.4
Significant change in unrecognized tax benefit, settlement and expiration period	12 months