Leases (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Lease Cost
Operating lease cost	$ 243.9
Variable lease cost	25.5
Short-term lease cost	3.9
Sublease income	(3.9)
Finance leases, Amortization of ROU assets	31.6
Finance leases, Interest	3.8
Finance leases, Total lease cost	35.4
Total lease cost	304.8
Balance Sheet Classification and Weighted Average Remaining Lease Term and Weighted Average Discount Rate for Operating and Finance Leases
Operating Lease Right-Of-Use Assets	1,382.7	$ 1,306.5	$ 0.0
Operating lease liability, current	$ 273.7
Operating lease liability, current, balance sheet location	us-gaap:OtherLiabilitiesCurrent
Operating lease liability, long-term	$ 1,277.0	$ 1,258.5	$ 0.0
Operating lease liability, long-term, balance sheet location	us-gaap:OperatingLeaseLiabilityNoncurrent
Operating lease liability, total	$ 1,550.7
Operating leases, weighted average remaining lease term	8 years 4 months 24 days
Operating leases, weighted average discount rate	3.80%
Finance lease right-of-use assets	$ 130.0
Finance lease right-of-use asset, balance sheet location	us-gaap:PropertyPlantAndEquipmentNet
Finance lease liability, current	$ 43.2
Finance lease liability, current, balance sheet location	us-gaap:OtherLiabilitiesCurrent
Finance lease liability, long-term	$ 91.5
Finance lease liability, long-term, balance sheet location	us-gaap:OtherLiabilitiesNoncurrent
Finance lease liability, total	$ 134.7
Finance leases, weighted average remaining lease term	2 years 9 months 18 days
Finance leases, weighted average discount rate	4.10%
Maturity of Undiscounted Cash Flows for Operating and Finance Leases
Operating Leases Payments, 2019 Remainder	$ 85.3
Operating Leases Payments, 2020	320.8
Operating Leases Payments, 2021	269.1
Operating Leases Payments, 2022	217.8
Operating Leases Payments, 2023	170.6
Operating Leases Payments, 2024	147.8
Operating Leases Payments, Thereafter	626.0
Operating Leases, Total lease payments	1,837.4
Operating Leases, Less: Interest	286.7
Operating Leases, Present value of lease liability	1,550.7
Finance Leases Payments, 2019 Remainder	12.4
Finance Leases Payments, 2020	46.9
Finance Leases Payments, 2021	38.3
Finance Leases Payments, 2022	24.9
Finance Leases Payments, 2023	12.4
Finance Leases Payments, 2024	4.8
Finance Leases Payments, Thereafter	2.6
Finance Leases, Total lease payments	142.3
Finance Leases, Less: Interest	7.6
Finance Leases, Present value of lease liability	$ 134.7