Accumulated Other Comprehensive Loss, Net of Tax (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023	Dec. 31, 2022
Foreign currency translation adjustment:
Balance at beginning of period	$ (789.1)	$ (849.1)
Other comprehensive (loss) income before reclassifications	(3.8)	(28.6)
Amount reclassified from accumulated other comprehensive loss, net of tax	1.2	0.5
Balance at end of period	(791.7)	(877.2)
Derivative Instrument:
Balance at beginning of period	33.5	35.0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	0.0	0.5
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	2.1	1.3
Balance at end of period	31.4	34.2
Defined Benefit Pension and Other Postretirement Plans
Balance at beginning of period	(185.8)	(172.8)	$ (190.6)	$ (179.6)
Other comprehensive (loss) income before reclassifications	0.8	2.8
Amount reclassified from accumulated other comprehensive loss, net of tax	4.0	4.0
Total:
Balance at beginning of period	(946.2)	(993.7)
Other comprehensive (loss) income before reclassifications	(3.0)	(25.3)
Amount reclassified from accumulated other comprehensive loss, net of tax	3.1	3.2
Balance at end of period	$ (946.1)	$ (1,015.8)