Leases Leases (Supplemental balance sheet) (Details) - USD ($) $ in Millions		Dec. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Operating lease right-of-use assets		$ 93.1	$ 0.0
Finance Lease, Right-of-Use Asset	[1]	3.2
Lease Right of Use Asset		96.3
Current operating lease liabilities		60.6	0.0
Current finance lease liability		0.3
Long-term operating lease liabilities		33.0	0.0
Long-term finance lease liability		2.4
Lease Liability		96.3
Finance Lease, Right-of-Use Asset, Accumulated Amortization		$ 7.1	$ 6.7

[1] Finance lease assets are recorded net of accumulated amortization of $7.1 million as of December 31, 2019.