Leases - Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Mar. 31, 2019	Jan. 01, 2019
Lessee, Lease, Description [Line Items]
Cash Paid For Amounts Included In Measurement of Liabilities	$ 32.3
Operating Cash Flows From Financing Leases	3.9
Operating Cash Flows From Operating Leases	23.5
Financing Cash Flows From Financing Leases	4.9
ROU Assets Obtained In Exchange For New Financing Liabilities	0.0
ROU Asset Obtained In Exchange for New Operating Liabilities	27.5	$ 0.0	$ 0.0
Right-of-Use Asset Obtained in Exchange for Finance Lease Rent Prepayment	44.2
Finance lease, right-of-use asset	127.2	0.0
Right-of-Use Asset Obtained in Exchange for Operating Lease, Rent Prepayments	26.6
Right of use operating assets	$ 204.0	$ 0.0
Accounting Standards Update 2016-02
Lessee, Lease, Description [Line Items]
Finance lease, right-of-use asset				$ 83.1
Right of use operating assets				$ 172.2	$ 326.1