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Goodwill and Other Intangible Assets - Schedule of Goodwill and Other Intangible Assets Rollforward (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Acquired Finite-Lived Intangible Assets [Line Items]        
Goodwill, beginning balance     $ 176.5  
Goodwill, ending balance $ 168.8   168.8  
Goodwill        
Acquired Finite-Lived Intangible Assets [Line Items]        
Goodwill, beginning balance 168.8 $ 142.3 176.5 $ 142.3
Acquisition of businesses 0.0 59.5 0.0 59.5
Dispositions     (6.7) 0.0
Measurement period adjustments     (1.0) 0.0
Amortization of other intangible assets 0.0 0.0 0.0 0.0
Goodwill, ending balance 168.8 201.8 168.8 201.8
Other        
Acquired Finite-Lived Intangible Assets [Line Items]        
Other intangible assets (excluding goodwill), beginning balance 207.4 197.2 215.9 198.2
Acquisition of businesses 0.0 0.0 0.0 0.0
Dispositions     (6.9) 0.0
Measurement period adjustments     0.0 0.0
Amortization of other intangible assets (2.6) (1.0) (4.2) (2.0)
Other intangible assets (excluding goodwill), ending balance 204.8 196.2 204.8 196.2
Total Goodwill and Other Intangible Assets        
Acquired Finite-Lived Intangible Assets [Line Items]        
Other intangible assets, gross (including goodwill), beginning balance 376.2 339.5 392.4 340.5
Acquisition of businesses 0.0 59.5 0.0 59.5
Dispositions     (13.6) 0.0
Measurement period adjustments     (1.0) 0.0
Amortization of other intangible assets (2.6) (1.0) (4.2) (2.0)
Other intangible assets, gross (including goodwill), ending balance $ 373.6 $ 398.0 $ 373.6 $ 398.0