Presentation of Financial Statements (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2017	Dec. 31, 2016
Accounting Changes [Line Items]
Operating Leases, Present value of lease liability		$ 1,565.0
Other current assets	$ 1,241.4	1,188.8	$ 1,212.2
Operating Lease Right-Of-Use Assets	0.0	1,398.3	1,306.5
Total assets	24,617.0	26,783.4	25,894.3
Other current liabilities	1,958.6	2,131.9	2,131.1
Long-Term Liability - Operating Leases	0.0	1,274.7	1,258.5
Long-Term Liabilities	1,197.8	1,006.8	1,044.1
Total liabilities and equity	24,617.0	$ 26,783.4	25,894.3
Cumulative effect of accounting change	(22.3)
Cumulative effect of accounting change	(22.3)
Accounting Standards Update 2016-02 [Member]
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	22.3			$ 23.6	$ (31.6)
Retained Earnings | Accounting Standards Update 2018-02 [Member]
Accounting Changes [Line Items]
Cumulative effect of accounting change	22.3
Cumulative effect of accounting change	$ 22.3