Leases (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Leases [Abstract]
Lessee, Operating Lease, Term of Contract	15 years	15 years
Operating Lease, Payments		$ (115.2)
Short-term Lease, Cost	$ 2.6	5.9
Variable Lease, Cost	$ 4.7	$ 9.2
leases not yet commenced	50	50
Operating Leases, Rent Expense		$ 167.5	$ 85.1
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 254.1	254.1		$ 191.1
Finance Lease, Liability, Payments, Due Next Twelve Months	7.1	7.1		8.6
Finance Lease, Liability, Payment, Due	88.9	88.9
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(155.6)	(155.6)
Finance Lease, Liability, Undiscounted Excess Amount	(34.5)	(34.5)
Operating Lease, Right-of-Use Asset	770.3	770.3
Operating Lease, Liability, Current	229.2	229.2		0.0
Operating Lease, Liability, Noncurrent	586.1	586.1		0.0
Operating Lease, Liability	815.3	815.3
Finance Lease, Right-of-Use Asset	85.4	85.4
Finance Lease, Liability, Current	8.2	8.2		7.9
Finance Lease, Liability, Noncurrent	46.2	46.2		51.0
Finance Lease, Liability	$ 54.4	$ 54.4
Operating Lease, Weighted Average Remaining Lease Term	5 years 9 months 18 days	5 years 9 months 18 days
Operating Lease, Cost	$ 59.9	$ 110.8
Finance Lease, Right-of-Use Asset, Amortization	1.5	2.9
Finance Lease, Interest Expense	$ 0.4	$ 1.2
Finance Lease, Weighted Average Remaining Lease Term	6 years 6 months	6 years 6 months
Operating Lease, Weighted Average Discount Rate, Percent	4.20%	4.20%
Finance Lease, Weighted Average Discount Rate, Percent	4.80%	4.80%
Operating Leases, Future Minimum Payments, Due in Two Years	$ 274.7	$ 274.7		145.4
Finance Lease, Liability, Payments, Due Year Two	13.8	13.8		8.0
Operating Leases, Future Minimum Payments, Due in Three Years	174.6	174.6		107.0
Finance Lease, Liability, Payments, Due Year Three	12.0	12.0		6.7
Operating Leases, Future Minimum Payments, Due in Four Years	69.3	69.3		80.9
Finance Lease, Liability, Payments, Due Year Four	10.8	10.8		6.0
Operating Leases, Future Minimum Payments, Due in Five Years	45.1	45.1		61.5
Finance Lease, Liability, Payments, Due Year Five	10.7	10.7		6.5
Operating Leases, Future Minimum Payments, Due Thereafter	153.1	153.1		155.6
Finance Lease, Liability, Payments, Due after Year Five	34.5	34.5		$ 23.1
Lessee, Operating Lease, Liability, Payments, Due	970.9	970.9
Lease, Cost	$ 1.9	4.1
Finance Lease, Interest Payment on Liability		(0.9)
Finance Lease, Principal Payments		(4.8)
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability		43.7
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability		$ 0.2
Lessee, Operating Lease, Renewal Term	15 years	15 years