Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Jan. 18, 2022	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		$ (97.9)	$ 430.0	$ (17.6)	$ 384.4
Foreign currency translation adjustment		(2.4)	0.1	(3.1)	1.2
Amortization related to derivatives securities, before tax		0.8	0.8	3.0	1.6
Tax impact		(0.2)	(0.2)	(0.8)	(0.4)
Total other comprehensive income (loss)		(1.8)	0.7	(0.9)	2.4
Ending balance		$ (71.0)	863.9	$ (71.0)	863.9
Amortization	$ 1.3
Senior Notes, 5.125%, due 2031 | Senior notes
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Debt repayments	$ 125.0
Stated interest rate	5.125%	5.125%		5.125%
Foreign currency translation adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		$ 4.1	5.5	$ 4.8	4.4
Foreign currency translation adjustment		(2.4)	0.1	(3.1)	1.2
Amortization related to derivatives securities, before tax		0.0	0.0	0.0	0.0
Tax impact		0.0	0.0	0.0	0.0
Total other comprehensive income (loss)		(2.4)	0.1	(3.1)	1.2
Ending balance		1.7	5.6	1.7	5.6
Valuation and amortization of derivative securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(14.0)	(17.4)	(15.6)	(18.0)
Foreign currency translation adjustment		0.0	0.0	0.0	0.0
Amortization related to derivatives securities, before tax		0.8	0.8	3.0	1.6
Tax impact		(0.2)	(0.2)	(0.8)	(0.4)
Total other comprehensive income (loss)		0.6	0.6	2.2	1.2
Ending balance		(13.4)	(16.8)	(13.4)	(16.8)
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(9.9)	(11.9)	(10.8)	(13.6)
Ending balance		$ (11.7)	$ (11.2)	$ (11.7)	$ (11.2)