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Derivatives and Hedging Activities - Pre-tax Effect of Derivatives on AOCI and Statement of Operations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Amortization of accumulated OCI related	$ 3.2		$ 3.2
Derivatives not designated as hedging instruments \| Other income
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Gain recognized in income	0.2	$ 0.0	0.2	$ 0.0
Derivatives in cash flow hedging relationships
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Loss (gain) recognized in OCI (effective portion)	5.8	(1.7)	4.9	26.9
Derivatives in cash flow hedging relationships \| Interest expense, net
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Gain recognized in income	$ 6.0	$ 5.6	$ 11.5	$ 9.0