Presentation of Financial Statements (Details) - USD ($) $ in Millions	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Accounting Changes [Line Items]
Operating Leases, Present value of lease payments	$ 1,474.0
Other current assets	1,266.0	$ 1,212.2	$ 1,241.4
Operating Lease Right-Of-Use Assets	1,298.8	1,306.5	0.0
Total assets	25,211.2	25,894.3	24,617.0
Other current liabilities	2,186.4	2,131.1	1,958.6
Long-Term Liability - Operating Leases	1,218.0	1,258.5	0.0
Long-Term Liabilities	1,027.1	1,044.1	1,197.8
Total liabilities and equity	$ 25,211.2	$ 25,894.3	24,617.0
Adoption of ASC 842 Increase (Decrease)
Accounting Changes [Line Items]
Operating Leases, Present value of lease payments			1,490.1
Other current assets			(29.2)
Operating Lease Right-Of-Use Assets			1,306.5
Total assets			1,277.3
Other current liabilities			172.5
Long-Term Liability - Operating Leases			1,258.5
Long-Term Liabilities			(153.7)
Total liabilities and equity			$ 1,277.3