Leases (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Lease Cost [Abstract]
Operating leases, Lease cost	$ 157.6
Operating leases, Variable lease cost	16.8
Operating leases, Sublease income	(2.7)
Operating lease expense	171.7
Short-term lease rent expense	2.5
Finance leases, Amortization of right-of-use assets	20.7
Finance leases, Interest on lease liability	2.5
Finance leases, Total lease cost	23.2
Total lease cost	197.4
Right-of-Use Assets [Abstract]
Operating lease, right-of-use assets	1,435.3	$ 1,306.5	$ 0.0
Finance lease, right-of-use assets	131.7
Leases, right-of-use assets	$ 1,567.0
Weighted Average Remaining Lease Term and Weighted Average Discount Rate [Abstract]
Operating Lease, Weighted Average Remaining Lease Term	8 years 4 months 24 days
Operating Lease, Weighted Average Discount Rate	3.90%
Finance Lease, Weighted Average Remaining Lease Term	3 years
Finance Lease, Weighted Average Discount Rate	4.20%
Reconciliation of Undiscounted Cash Flows and Liabilities for Operating and Finance Leases [Abstract]
Operating Leases Payments, 2019 Remainder	$ 173.0
Operating Leases Payments, 2020	317.5
Operating Leases Payments, 2021	264.5
Operating Leases Payments, 2022	213.2
Operating Leases Payments, 2023	166.5
Operating Leases Payments, 2024	145.3
Operating Leases Payments, Thereafter	615.3
Operating Leases, Total undiscounted lease payments	1,895.3
Operating Leases, Less: Imputed interest	298.3
Operating Leases, Present value of lease payments	1,597.0
Finance Leases Payments, 2019 Remainder	23.7
Finance Leases Payments, 2020	44.5
Finance Leases Payments, 2021	35.7
Finance Leases Payments, 2022	22.1
Finance Leases Payments, 2023	10.4
Finance Leases Payments, 2024	4.3
Finance Leases Payments, Thereafter	3.0
Finance Leases, Total undiscounted lease payments	143.7
Finance Leases, Less: Imputed interest	10.1
Finance Leases, Present value of lease payments	133.6
Lease Liabilities Recorded on Balance Sheet [Abstract]
Operating Leases Liability, Other Current Liabilities	$ 279.1
Operating Leases Liability, Current, Balance Sheet Location	us-gaap:OtherLiabilitiesCurrent
Long-Term Liability - Operating Leases	$ 1,317.9	$ 1,258.5	$ 0.0
Operating Lease Liability, Long-term, Balance Sheet Location	us-gaap:OperatingLeaseLiabilityNoncurrent
Finance Leases Liability, Other Current Liabilities	$ 42.8
Finance Leases Liability, Current, Balance Sheet Location	us-gaap:OtherLiabilitiesCurrent
Finance Leases Liability, Long-term liabilities	$ 90.8
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	$ 1,410.2
Finance lease, right-of-use assets	0.0
Leases, right-of-use assets	1,410.2
Equipment Lease [Member]
Right-of-Use Assets [Abstract]
Operating lease, right-of-use assets	25.1
Finance lease, right-of-use assets	131.7
Leases, right-of-use assets	$ 156.8