Revenue Recognition and Accounts Receivable (Narrative) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Revenue Recognition And Accounts Receivable [Line Items]
Sales allowances, current	$ 1,630.0	$ 1,980.0
Accrued sales allowances and other adjustments	670.0	818.0
Total Current Allowances	2,296.5	2,795.2
Securitized accounts receivable	427.9	$ 1,040.0
Receivables Facility
Revenue Recognition And Accounts Receivable [Line Items]
Accounts receivable securitization facility maximum borrowing capacity	$ 400.0