Accumulated Other Comprehensive Loss - Changes in AOCI (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning of period	$ 2,370.6
Other comprehensive income (loss) before reclassifications	8.2
Amounts reclassified from accumulated other comprehensive income (loss)	1.1
Other comprehensive income	9.3	$ 5.4
End of period	2,483.1
Cash flow hedge gain (loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning of period	0.6
Other comprehensive income (loss) before reclassifications	0.0
Amounts reclassified from accumulated other comprehensive income (loss)	(0.3)
Other comprehensive income	(0.3)
End of period	0.3
Unrealized gain (loss) on available-for- sale securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning of period	(0.8)
Other comprehensive income (loss) before reclassifications	0.3
Amounts reclassified from accumulated other comprehensive income (loss)	0.0
Other comprehensive income	0.3
End of period	(0.5)
Pension and post retirement benefit plan adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning of period	(188.6)
Other comprehensive income (loss) before reclassifications	0.0
Amounts reclassified from accumulated other comprehensive income (loss)	1.4
Other comprehensive income	1.4
End of period	(187.2)
Cumulative translation adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning of period	(156.4)
Other comprehensive income (loss) before reclassifications	7.9
Amounts reclassified from accumulated other comprehensive income (loss)	0.0
Other comprehensive income	7.9
End of period	(148.5)
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning of period	(345.2)	(330.8)
Other comprehensive income	9.3	5.4
End of period	$ (335.9)	$ (325.4)