Accumulated Other Comprehensive Loss (Reclassifications) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of amounts accumulated for interest rate swaps de-designated as cash flow hedges, net of tax	$ (1.8)	$ 0.0
Interest expense	14.5	18.1
Income tax expense (benefit)	0.5	(1.2)
Interest Rate Swap Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of amounts accumulated for interest rate swaps de-designated as cash flow hedges, net of tax	(1.8)	$ 0.0
Interest Rate Swap Adjustments | Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of amounts accumulated for interest rate swaps de-designated as cash flow hedges, net of tax	(1.8)
Interest expense	1.8
Income tax expense (benefit)	$ 0.0