Accumulated Other Comprehensive Loss - Changes in AOCI (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning equity			$ 2,240.7		$ 2,240.7
Other comprehensive income (loss) before reclassifications					(55.2)
Amounts reclassified from accumulated other comprehensive loss					11.8
Other comprehensive (loss) income	$ (23.0)	$ (10.9)			(43.4)	$ (3.9)
Ending equity	2,330.2				2,330.2
Cash flow hedge (loss) gain
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning equity			0.4		0.4
Other comprehensive income (loss) before reclassifications					1.3
Amounts reclassified from accumulated other comprehensive loss					(0.4)
Other comprehensive (loss) income					0.9
Ending equity	1.3				1.3
Unrealized gain (loss) on available-for- sale securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning equity			0.6		0.6
Other comprehensive income (loss) before reclassifications					(2.1)
Amounts reclassified from accumulated other comprehensive loss					0.0
Other comprehensive (loss) income					(2.1)
Ending equity	(1.5)				(1.5)
Pension and post retirement benefit plan adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning equity			(202.8)		(202.8)
Other comprehensive income (loss) before reclassifications					(2.9)
Amounts reclassified from accumulated other comprehensive loss					11.7
Other comprehensive (loss) income					8.8
Ending equity	(194.0)				(194.0)
Cumulative translation adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning equity			(129.0)		(129.0)
Other comprehensive income (loss) before reclassifications					(51.5)
Amounts reclassified from accumulated other comprehensive loss					0.5
Other comprehensive (loss) income					(51.0)
Ending equity	(180.0)				(180.0)
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning equity	(351.2)	(322.2)	(330.8)	$ (329.2)	(330.8)	(329.2)
Other comprehensive (loss) income	(23.0)	(10.9)	(20.4)	7.0
Ending equity	$ (374.2)	$ (333.1)	$ (351.2)	$ (322.2)	$ (374.2)	$ (333.1)