Leases - Lease Cost and Other Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finance leases
Amortization of ROU assets	$ 9.1
Interest on lease liabilities	2.1
Operating leases	32.9
Short-term lease cost	5.9
Variable lease cost	5.2
Total lease cost	55.2
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows - finance leases	5.1
Operating cash flows - operating leases	34.7
Financing cash flows - finance leases	9.3	$ 1.6	$ 0.0
Right-Of-Use Asset Obtained In Exchange For Lease Liability [Abstract]
ROU assets obtained in exchange for new finance lease liabilities	21.3
ROU assets obtained in exchange for new operating lease liabilities	$ 34.7
Finance leases
Remaining lease term (in years)	6 years 4 months 24 days
Discount rate	4.90%
Operating leases
Remaining lease term (in years)	4 years 10 months 24 days
Discount rate	5.20%