Leases - Lease Cost and Other Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Finance leases
Amortization of ROU assets	$ 10.6	$ 10.9
Interest on lease liabilities	1.5	1.8
Operating leases	31.7	31.1
Short-term lease cost	4.9	3.7
Variable lease cost	5.7	5.8
Total lease cost	54.4	53.3
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows - finance leases	4.8	4.4
Operating cash flows - operating leases	30.4	33.3
Financing cash flows - finance leases	10.5	11.6	$ 9.3
ROU assets obtained in exchange for new finance lease liabilities	5.7	7.1
ROU assets obtained in exchange for new operating lease liabilities	$ 17.2	$ 14.3
Finance leases
Remaining lease term (in years)	5 years 10 months 24 days	6 years 1 month 6 days
Discount rate	4.60%	4.70%
Operating leases
Remaining lease term (in years)	4 years 4 months 24 days	4 years 6 months
Discount rate	4.70%	5.00%