Leases - Lease Cost and Other Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Finance leases
Amortization of ROU assets	$ 10.0	$ 10.5	$ 10.6
Interest on lease liabilities	1.8	1.3
Operating leases	37.5	33.2
Short-term lease cost	3.5	2.7
Variable lease cost	6.6	7.0
Total lease cost	59.4	54.7
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows - finance leases	4.3	5.4
Operating cash flows - operating leases	37.7	30.6
Financing cash flows - finance leases	9.0	10.0	$ 10.5
ROU assets obtained in exchange for new finance lease liabilities	16.7	8.8
ROU assets obtained in exchange for new operating lease liabilities	$ 49.9	$ 34.4
Finance leases
Remaining lease term (in years)	6 years 4 months 24 days	6 years 1 month 6 days
Discount rate	7.40%	4.90%
Operating leases
Remaining lease term (in years)	4 years 1 month 6 days	4 years 2 months 12 days
Discount rate	5.80%	4.80%