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Goodwill and Intangible Assets - Balances of Acquired Intangible Assets, Excluding Goodwill (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]    
Original cost $ 197.4 $ 196.2
Accumulated amortization (138.7) (133.1)
Carrying amount 58.7 63.1
Customer Lists    
Finite-Lived Intangible Assets [Line Items]    
Original cost 154.6 150.6
Accumulated amortization (104.9) (100.8)
Carrying amount $ 49.7 $ 49.8
Weighted-average original life (in years) 15 years 15 years
Trade Names    
Finite-Lived Intangible Assets [Line Items]    
Original cost $ 27.6 $ 29.3
Accumulated amortization (20.8) (19.2)
Carrying amount $ 6.8 $ 10.1
Weighted-average original life (in years) 11 years 11 years
Technology    
Finite-Lived Intangible Assets [Line Items]    
Original cost $ 15.2 $ 16.3
Accumulated amortization (13.0) (13.1)
Carrying amount $ 2.2 $ 3.2
Weighted-average original life (in years) 11 years 11 years