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Goodwill and Other Intangible Assets - Schedule of Goodwill and Other Intangible Assets Rollforward (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Goodwill    
Goodwill, beginning balance $ 168.8 $ 176.5
Acquisition of businesses 270.4 0.0
Dispositions 0.0 (6.7)
Measurement period adjustments 0.0 (1.0)
Goodwill, ending balance 439.2 168.8
Other Intangible Assets    
Other intangible assets (excluding goodwill), beginning balance 201.8 215.9
Acquisition of businesses 101.0 0.0
Acquisition of intangible assets 0.3 0.0
Dispositions 0.0 (6.9)
Amortization (5.7) (1.6)
Other intangible assets (excluding goodwill), ending balance 297.4 207.4
Total Goodwill and Other Intangible Assets    
Total Goodwill and Other Intangible Assets, beginning balance 370.6 392.4
Acquisition of businesses 371.4 0.0
Acquisition of intangible assets 0.3 0.0
Dispositions 0.0 (13.6)
Measurement period adjustments 0.0 (1.0)
Amortization (5.7) (1.6)
Total Goodwill and Other Intangible Assets, ending balance $ 736.6 $ 376.2