Goodwill and Intangible Assets (Changes to Intangible Assets) (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Finite-Lived and Indefinite-Lived Intangible Assets [Roll Forward]
Balance at beginning of period, net of accumulated amortization	$ 308.9	$ 344.9
Additions	163.2	0.0
Amortization expense	(33.7)	(35.9)
Currency translation and other	1.8	(0.1)
Balance at end of period, net of accumulated amortization	$ 440.2	$ 308.9