Commitments Commitments (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Commitments [Abstract]
Operating Leases, Rent Expense	$ 216.2	$ 105.1	$ 106.1
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Operating Leases, Future Minimum Payments Due, Current	219.1
Operating Leases, Future Minimum Payments, Due in Two Years	189.4
Operating Leases, Future Minimum Payments, Due in Three Years	150.8
Operating Leases, Future Minimum Payments, Due in Four Years	113.8
Operating Leases, Future Minimum Payments, Due in Five Years	91.4
Operating Leases, Future Minimum Payments, Due Thereafter	260.8
Operating Leases, Future Minimum Payments Due	$ 1,025.3