Leases Components of Lease Expense (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Leases expenses [Abstract]
Operating lease cost including variable costs	$ 90.0	$ 273.4
Short-term lease costs	4.1	19.0
Less: sublease income	2.5	6.5
Net lease cost	$ 91.6	$ 285.9