Leases - Maturities of Lease Liabilities (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Dec. 31, 2018
Maturities of lease liabilities [Line Items]
Lessee, Operating Lease, Discount Rate	$ (83.9)	$ (83.9)
Sublease Income	17.2	53.0
Operating Leases
Total discounted lease liabilities	440.3	440.3	$ 0.0
Finance Leases
Total discounted lease liabilities	0.0	0.0	11.3
Total
Total discounted lease liabilities	440.3	440.3	$ 11.3
Recourse Operating Leases [Member]
Maturities of lease liabilities [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	8.0	8.0
Operating Leases, Future Minimum Payments, Due in Two Years	67.8	67.8
Operating Leases, Future Minimum Payments, Due in Three Years	66.3	66.3
Operating Leases, Future Minimum Payments, Due in Four Years	57.5	57.5
Operating Leases, Future Minimum Payments, Due in Five Years	54.8	54.8
Operating Leases, Future Minimum Payments, Due Thereafter	269.8	269.8
Operating Leases, Future Minimum Payments Due	$ 524.2	$ 524.2