Commitments and Contingencies (Leases) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Operating lease, right-of-use assets, net	$ 39.6		$ 39.6		$ 53.8
Accrued expenses and other liabilities	156.5		156.5		161.7
Operating leases	29.6		29.6		41.5
Property, plant and equipment	3,750.9		3,750.9		3,612.5
Less: accumulated depreciation	799.2		799.2		703.4
Property, plant and equipment, net	2,951.7		2,951.7		2,909.1
Other long-term liabilities	289.1		289.1		301.6
Operating Lease, Expense	5.8	$ 6.2	20.4	$ 20.8
Finance Lease Expense	0.9	$ 1.0	3.1	$ 3.2
Operating Leases
Lessee, Lease, Description [Line Items]
Operating lease, right-of-use assets, net	39.6		39.6		53.8
Accrued expenses and other liabilities	16.5		16.5		18.1
Operating leases	29.6		29.6		41.5
Operating lease, liability	46.1		46.1		59.6
Finance Lease
Lessee, Lease, Description [Line Items]
Accrued expenses and other liabilities	3.0		3.0		3.2
Property, plant and equipment	13.5		13.5		14.9
Less: accumulated depreciation	7.2		7.2		5.4
Property, plant and equipment, net	6.3		6.3		9.5
Other long-term liabilities	2.7		2.7		5.2
Finance Lease, Liability	$ 5.7		$ 5.7		$ 8.4