Leases (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Leases
Operating lease cost	$ 21.0	$ 19.2	$ 62.3	$ 54.4
Variable fees and other	7.9	8.2	23.1	24.1
Total lease cost	$ 28.9	$ 27.4	85.4	78.5
Cash payments for operating leases			84.5	78.0
Right-of-use assets obtained in exchange for operating lease obligations			$ 81.5	$ 66.3
Weighted average remaining lease term - operating leases	6 years 7 months 6 days		6 years 7 months 6 days		6 years 3 months 18 days
Weighted average discount rate - operating leases	4.90%		4.90%		4.60%
Maturities of operating lease liabilities
2025 (remaining three months)	$ 20.5		$ 20.5
2026	74.6		74.6
2027	63.7		63.7
2028	53.2		53.2
2029	44.4		44.4
Thereafter	106.6		106.6
Total operating lease payments	363.0		363.0
Less: imputed interest	(56.2)		(56.2)
Total operating lease liabilities	$ 306.8		$ 306.8

Amount of lessee's undiscounted obligation for lease payment for operating lease due year five and after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

No definition available.