Leases Components of Lease Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Components of Lease Expense [Abstract]
Operating Lease, Expense	$ 109.0	$ 123.2	$ 125.4
Finance Lease, Right-of-Use Asset, Amortization	0.7
Finance Lease, Interest Expense	0.4
Variable Lease, Cost	$ 13.2