Commitments and Contingencies Minimum Lease Payments Under ASC 842 (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Minimum Lease Payments [Abstract]
Current operating lease lease liabilities	$ 18.4	$ 0.0
Operating lease liabilities	45.3	0.0
Operating Leases, Future Minimum Payments Due, Next Twelve Months	6.2	17.4
Operating Leases, Future Minimum Payments, Due in Two Years	21.7	13.8
Operating Leases, Future Minimum Payments, Due in Three Years	19.9	9.1
Operating Leases, Future Minimum Payments, Due in Four Years	15.4	7.4
Operating Leases, Future Minimum Payments, Due in Five Years	9.8	4.5
Operating Leases, Future Minimum Payments, Due Thereafter	0.7	$ 0.0
Less: Interest (1)	(10.0)
Operating Lease, Liability	$ 63.7