Commitments and Contingencies Long-term Operating lease commitments (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Operating lease commitments [Abstract]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 22.3	$ 17.4
Operating Leases, Future Minimum Payments, Due in Two Years	20.4	13.8
Operating Leases, Future Minimum Payments, Due in Three Years	15.9	9.1
Operating Leases, Future Minimum Payments, Due in Four Years	10.6	7.4
Operating Leases, Future Minimum Payments, Due in Five Years	1.4	4.5
Operating Leases, Future Minimum Payments, Due Thereafter	2.4	0.0
Operating Leases, Undiscounted Interest	(10.2)
Operating Lease, Liability	62.8
Current operating lease liabilities	18.0	0.0
Operating lease liabilities	$ 44.8	$ 0.0