Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Changes in Accumulated Other Comprehensive Income (Loss)
January 1	$ (1,437.9)	$ (1,252.3)
Other comprehensive income (loss) before reclassifications	92.9	(197.2)
Reclassification from accumulated other comprehensive income (loss)	7.4	11.6
December 31	(1,337.6)	(1,437.9)
Cash Flow Hedge
Changes in Accumulated Other Comprehensive Income (Loss)
January 1	(12.1)	(16.1)
Other comprehensive income (loss) before reclassifications	0.0	0.0
Reclassification from accumulated other comprehensive income (loss)	4.0	4.0
December 31	(8.1)	(12.1)
Defined Benefit Pension Plans and Postemployment Arrangements
Changes in Accumulated Other Comprehensive Income (Loss)
January 1	(41.3)	(90.4)
Other comprehensive income (loss) before reclassifications	(4.8)	41.5
Reclassification from accumulated other comprehensive income (loss)	3.4	7.6
December 31	(42.7)	(41.3)
Foreign Currency Translation
Changes in Accumulated Other Comprehensive Income (Loss)
January 1	(1,384.5)	(1,145.8)
Other comprehensive income (loss) before reclassifications	97.7	(238.7)
Reclassification from accumulated other comprehensive income (loss)	0.0	0.0
December 31	$ (1,286.8)	$ (1,384.5)