Leases (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Leases
Operating lease cost	$ 27.4	$ 25.0	$ 78.5	$ 72.0
Cash payments for operating leases			78.0	70.6
Right-of-use assets obtained in exchange for operating lease obligations			$ 66.3	$ 55.6
Weighted average remaining lease term - operating leases	5 years 10 months 24 days		5 years 10 months 24 days		5 years 9 months 18 days
Weighted average discount rate - operating leases	4.50%		4.50%		4.30%
Maturities of operating lease liabilities
2024 (remaining three months)	$ 18.7		$ 18.7
2025	68.2		68.2
2026	55.6		55.6
2027	44.8		44.8
2028	36.7		36.7
Thereafter	93.6		93.6
Total operating lease payments	317.6		317.6
Less: imputed interest	(46.7)		(46.7)
Total operating lease liabilities	$ 270.9		$ 270.9