Goodwill and Intangible Assets - Balances of Acquired Intangible Assets, Excluding Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]
Original cost	$ 222.7	$ 197.4
Accumulated amortization	(170.1)	(138.7)
Carrying amount	52.6	58.7
Customer Lists
Finite-Lived Intangible Assets [Line Items]
Original cost	174.9	154.6
Accumulated amortization	(128.1)	(104.9)
Carrying amount	$ 46.8	$ 49.7
Weighted-average original life (in years)	14 years	15 years
Trade Names
Finite-Lived Intangible Assets [Line Items]
Original cost	$ 31.1	$ 27.6
Accumulated amortization	(26.6)	(20.8)
Carrying amount	$ 4.5	$ 6.8
Weighted-average original life (in years)	10 years	11 years
Technology
Finite-Lived Intangible Assets [Line Items]
Original cost	$ 16.7	$ 15.2
Accumulated amortization	(15.4)	(13.0)
Carrying amount	$ 1.3	$ 2.2
Weighted-average original life (in years)	12 years	11 years