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Leases (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Leases
Operating lease cost	$ 20.1	$ 17.6
Variable fees and other	8.0	7.6
Total lease cost	28.1	25.2
Cash payments for operating leases	27.8	25.3
Right-of-use assets obtained in exchange for operating lease obligations	$ 27.8	$ 28.2
Weighted average remaining lease term - operating leases	6 years 4 months 24 days		6 years 3 months 18 days
Weighted average discount rate - operating leases	4.70%		4.60%
Maturities of operating lease liabilities
2025 (remaining nine months)	$ 57.0
2026	66.1
2027	54.6
2028	45.0
2029	36.3
Thereafter	76.5
Total operating lease payments	335.5
Less: imputed interest	(48.5)
Total operating lease liabilities	$ 287.0

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- Definition

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).

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Amount of variable lease cost and short term lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases.

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Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in next 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).

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Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in fourth 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).

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Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in third 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).

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Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in second 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).

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Amount of lessee's undiscounted obligation for lease payment for operating lease having initial or remaining lease term in excess of one year to be paid in remainder of current fiscal year.

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Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating lease.

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Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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