Debt (Derivative Contracts) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Feb. 29, 2020	Aug. 31, 2019
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other derivative liabilities	$ 50.7	$ 103.0
Other derivative assets	15.0	63.8
Extended Interest Rate Swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Terminated derivative, notional amount			$ 550.0	$ 375.0
Derivative Instruments gain (loss), net	(44.3)	(55.6)
Extended Interest Rate Swaps | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other derivative liabilities	49.9	103.0
Offsetting Interest Rate Swap
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other derivative liabilities - other long-term liabilities	0.8
Other derivative assets	11.1	55.5
Derivative Instruments gain (loss), net	$ 44.0	$ 52.9
Senior notes: August 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest rate	2.50%			2.50%
Senior notes: March 2030
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest rate	2.30%		2.30%