Leases - Lease Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Finance lease, right-of-use asset	$ 127.2	$ 0.0
Right of use operating assets	204.0	0.0
Noncurrent operating lease liabilities	164.1	$ 0.0
Right Of Use Operating Assets [Member]
Lessee, Lease, Description [Line Items]
Finance lease, right-of-use asset	0.0
Right of use operating assets	204.0
Property, Plant and Equipment [Member]
Lessee, Lease, Description [Line Items]
Finance lease, right-of-use asset	116.3
Right of use operating assets	0.0
Other Current Assets [Member]
Lessee, Lease, Description [Line Items]
Finance Lease, Liability, Current	5.2
Operating Lease, Liability, Current	18.8
Right Of Use Operating Liabilities [Member]
Lessee, Lease, Description [Line Items]
Finance Lease, Liability, Noncurrent	0.0
Noncurrent operating lease liabilities	164.1
Other Liabilities
Lessee, Lease, Description [Line Items]
Finance Lease, Liability, Noncurrent	72.9
Noncurrent operating lease liabilities	$ 0.0