Leases (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Lease Cost [Abstract]
Operating leases, Lease cost	$ 75.5
Operating leases, Variable lease cost	10.1
Operating leases, Sublease income	(1.3)
Operating lease expense	84.3
Short-term lease rent expense	1.4
Finance leases, Amortization of right-of-use use assets	10.2
Finance leases, Interest on lease liability	1.2
Finance leases, Total lease cost	11.4
Total lease cost	97.1
Right-of-Use Assets [Abstract]
Operating Lease Right-Of-Use Assets	1,298.8	$ 1,306.5	$ 0.0
Finance Lease Right-of-Use Assets	$ 127.6
Weighted Average Remaining Lease Term and Weighted Average Discount Rate [Abstract]
Operating Lease, Weighted Average Remaining Lease Term	8 years 5 months
Operating Lease, Weighted Average Discount Rate	3.90%
Finance Lease, Weighted Average Remaining Lease Term	3 years 2 months
Finance Lease, Weighted Average Discount Rate	4.00%
Reconciliation of Undiscounted Cash Flows and Liabilities for Operating and Finance Leases [Abstract]
Operating Leases Payments, 2019 Remainder	$ 232.2
Operating Leases Payments, 2020	274.7
Operating Leases Payments, 2021	234.8
Operating Leases Payments, 2022	189.1
Operating Leases Payments, 2023	148.0
Operating Leases Payments, 2024	130.7
Operating Leases Payments, Thereafter	540.1
Operating Leases, Total undiscounted lease payments	1,749.6
Operating Leases, Less: Imputed interest	275.6
Operating Leases, Present value of lease payments	1,474.0
Finance Leases Payments, 2019 Remainder	32.9
Finance Leases Payments, 2020	40.6
Finance Leases Payments, 2021	31.9
Finance Leases Payments, 2022	18.3
Finance Leases Payments, 2023	8.1
Finance Leases Payments, 2024	3.5
Finance Leases Payments, Thereafter	1.8
Finance Leases, Total undiscounted lease payments	137.1
Finance Leases, Less: Imputed interest	6.8
Finance Leases, Present value of lease payments	130.3
Lease Liabilities Recorded on Balance Sheet [Abstract]
Operating Leases Liability, Other Current Liabilities	$ 256.0
Operating Leases Liability, Current, Balance Sheet Location	us-gaap:OtherLiabilitiesCurrent
Long-Term Liability - Operating Leases	$ 1,218.0	$ 1,258.5	$ 0.0
Operating Lease Liability, Long-term, Balance Sheet Location	us-gaap:OperatingLeaseLiabilityNoncurrent
Finance Leases Liability, Other Current Liabilities	$ 40.5
Finance Leases Liability, Current, Balance Sheet Location	us-gaap:OtherLiabilitiesCurrent
Finance Leases Liability, Long-term liabilities	$ 89.8
Finance Leases Liability, Long-term, Balance Sheet Location	us-gaap:OtherLiabilitiesNoncurrent
Real Estate Lease [Member]
Right-of-Use Assets [Abstract]
Operating Lease Right-Of-Use Assets	$ 1,274.2
Finance Lease Right-of-Use Assets	0.0
Equipment Lease [Member]
Right-of-Use Assets [Abstract]
Operating Lease Right-Of-Use Assets	24.6
Finance Lease Right-of-Use Assets	$ 127.6