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Goodwill and Intangible Assets (Changes to Intangible Assets) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Finite-Lived and Indefinite-Lived Intangible Assets [Roll Forward]    
Balance at beginning of period, net of accumulated amortization $ 419.3 $ 308.9
Additions 1.4 161.8
Amortization expense (11.3) (47.0)
Currency translation 2.9 (4.4)
Balance at end of period, net of accumulated amortization $ 412.3 $ 419.3