Financial Instruments - Derivative Hedging Activities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Interest expense	$ (94.0)	$ (78.4)	$ (177.5)	$ (156.7)
Interest rate swap locks:
Amount of loss reclassified from accumulated other comprehensive loss into income, net of tax	1.1	1.2	2.2	2.3
Net swap settlements
Gain (Loss) on Fair Value Hedges Recognized in Earnings [Abstract]
Gain (loss) on interest rate swaps	1.4	2.0	3.2	3.9
2022 Interest Rate Swap
Gain (Loss) on Fair Value Hedges Recognized in Earnings [Abstract]
Gain (loss) on interest rate swaps	1.9	1.0	5.2	2.4
Interest Expense | Net swap settlements | Fair Value Hedging
Gain (Loss) on Fair Value Hedges Recognized in Earnings [Abstract]
Gain (loss) on interest rate swaps	1.4	2.0	3.2	3.9
Interest Expense | Net periodic (loss) earnings | Fair Value Hedging
Gain (Loss) on Fair Value Hedges Recognized in Earnings [Abstract]
Gain (loss) on interest rate swaps	(0.6)	0.1	(1.2)	0.2
Interest Expense | Interest Rate Swap Locks | Cash Flow Hedging
Interest rate swap locks:
Amount of loss reclassified from accumulated other comprehensive loss into income, net of tax	(1.1)	(1.2)	(2.2)	(2.3)
Interest Expense | Interest Rate Contract
Gain (loss) on free-standing derivative instruments:
Net gain (loss) on change in fair value of free-standing derivative instruments	$ 0.4	$ (0.6)	$ 1.7	$ (0.2)