Components of Accumulated Other Comprehensive Loss - Components of AOCI (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive loss before income tax effect	$ (90.5)		$ (90.5)		$ (84.8)
Defined benefit plan liabilities	2.3		2.3		2.5
Accumulated other comprehensive loss	(88.2)		(88.2)		(82.3)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, start	479.0	$ 370.4	421.0	$ 546.1
Net amount reclassified to net income (loss)	(7.3)	1.2	(5.9)	3.6
Balance, end	516.6	320.2	516.6	320.2
Defined benefit plan liabilities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive loss before income tax effect	(92.3)		(92.3)		(86.7)
Defined benefit plan liabilities	2.6		2.6		2.9
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, start	(82.6)	(118.1)	(84.0)	(120.6)
Net amount reclassified to net income (loss)	(7.3)	1.2	(5.9)	3.7
Balance, end	(89.9)	(116.9)	(89.9)	(116.9)
Unrealized gain (loss) on financial instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive loss before income tax effect	1.8		1.8		1.9
Defined benefit plan liabilities	(0.4)		(0.4)		$ (0.4)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, start	1.7	1.7	1.7	1.8
Net amount reclassified to net income (loss)	0.0	(0.0)	0.0	(0.1)
Balance, end	1.7	1.7	1.7	1.7
Accumulated other comprehensive loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, start	(80.9)	(116.4)	(82.3)	(118.8)
Balance, end	$ (88.2)	$ (115.2)	$ (88.2)	$ (115.2)