Accumulated Other Comprehensive Loss - Changes in accumulated other comprehensive loss (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ 0.1		$ (17.0)
Changes in accumulated other comprehensive loss
Other comprehensive income, net of tax, before reclassifications	14.7
Amounts reclassified from AOCI, net of tax benefit of $—, $0.9, $—, and $0.9	2.6
Reclassification from AOCI, Current Period, Tax	0.9
Less: noncontrolling interest	(17.3)	$ (5.4)
Other comprehensive income	17.1
Currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(1.3)		(1.3)
Changes in accumulated other comprehensive loss
Other comprehensive income, net of tax, before reclassifications	0.0
Amounts reclassified from AOCI, net of tax benefit of $—, $0.9, $—, and $0.9	0.0
Reclassification from AOCI, Current Period, Tax	0.0
Other comprehensive income	0.0
Unrealized gains/(losses) on derivative financial instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	4.8		(12.2)
Changes in accumulated other comprehensive loss
Other comprehensive income, net of tax, before reclassifications	14.7
Amounts reclassified from AOCI, net of tax benefit of $—, $0.9, $—, and $0.9	2.5
Reclassification from AOCI, Current Period, Tax	0.9
Other comprehensive income	17.0
Accumulated Gain (Loss), Net, Cash Flow Hedge, Noncontrolling Interest [Member]
Changes in accumulated other comprehensive loss
Less: noncontrolling interest	(0.2)
Net actuarial gains/(losses) of defined benefit plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(3.4)		(3.5)
Changes in accumulated other comprehensive loss
Other comprehensive income, net of tax, before reclassifications	0.0
Amounts reclassified from AOCI, net of tax benefit of $—, $0.9, $—, and $0.9	0.1
Reclassification from AOCI, Current Period, Tax	0.0
Other comprehensive income	0.1
Noncontrolling Interest [Member]
Changes in accumulated other comprehensive loss
Less: noncontrolling interest	(0.2)	(0.3)
Accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	0.1		$ (17.0)
Changes in accumulated other comprehensive loss
Less: noncontrolling interest	$ (17.1)	$ (5.1)