Accumulated Other Comprehensive Loss - Changes in accumulated other comprehensive loss (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ 6.4				$ 6.4		$ (17.0)
Changes in accumulated other comprehensive loss
Other comprehensive income, net of tax, before reclassifications					16.8
Amounts reclassified from AOCI, net of tax benefit of $—, $1.3, $—, and $1.3					4.5
Reclassification from AOCI, Current Period, Tax					1.3
Reclassification adjustments for losses included in discontinued operations, net of tax benefit of $—, $—, $—, and $—	1.3		$ 0.0		1.3	$ 0.0
Less: noncontrolling interest	(5.3)	$ (17.3)	(1.6)	$ (5.4)	(22.6)	$ (7.0)
Other comprehensive income					23.4
Currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	0.0				0.0		(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 $—, $1.3, $—, and $1.3					0.0
Reclassification from AOCI, Current Period, Tax					0.0
Reclassification adjustments for losses included in discontinued operations, net of tax benefit of $—, $—, $—, and $—					1.3
Other comprehensive income					1.3
Unrealized gains/(losses) on derivative financial instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	9.8				9.8		(12.2)
Changes in accumulated other comprehensive loss
Other comprehensive income, net of tax, before reclassifications					16.8
Amounts reclassified from AOCI, net of tax benefit of $—, $1.3, $—, and $1.3					4.4
Reclassification from AOCI, Current Period, Tax					1.3
Reclassification adjustments for losses included in discontinued operations, net of tax benefit of $—, $—, $—, and $—					0.0
Other comprehensive income					22.0
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)				(3.4)		(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 $—, $1.3, $—, and $1.3					0.1
Reclassification from AOCI, Current Period, Tax					0.0
Reclassification adjustments for losses included in discontinued operations, net of tax benefit of $—, $—, $—, and $—					0.0
Other comprehensive income					0.1
Accumulated Gain (Loss), Net, Cash Flow Hedge, Noncontrolling Interest [Member]
Changes in accumulated other comprehensive loss
Less: noncontrolling interest					0.8
Noncontrolling Interest [Member]
Changes in accumulated other comprehensive loss
Less: noncontrolling interest	1.0	(0.2)	(0.4)	(0.3)	0.8
Accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	6.4				$ 6.4		$ (17.0)
Changes in accumulated other comprehensive loss
Less: noncontrolling interest	$ (6.3)	$ (17.1)	$ (1.2)	$ (5.1)