Presentation of Financial Statements (Details) - USD ($) $ in Millions	Sep. 30, 2019	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Accounting Changes [Line Items]
Operating Leases, Present value of lease liability	$ 1,550.7
Other current assets	1,179.5		$ 1,212.2	$ 1,241.4
Operating Lease Right-Of-Use Assets	1,382.7		1,306.5	0.0
Total assets	23,653.5		25,894.3	24,617.0
Other current liabilities	1,958.4		2,131.1	1,958.6
Long-Term Liability - Operating Leases	1,277.0		1,258.5	0.0
Long-Term Liabilities	975.5		1,044.1	1,197.8
Total liabilities and equity	$ 23,653.5		25,894.3	24,617.0
Adoption of ASC 842 Increase (Decrease)
Accounting Changes [Line Items]
Operating Leases, Present value of lease liability			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
Retained Earnings
Accounting Changes [Line Items]
Cumulative effect of accounting changes		$ 0.0		$ 22.3	$ 0.0	$ 23.6