Revenue Recognition and Accounts Receivable (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Revenue Recognition And Accounts Receivable [Line Items]
Trade receivables, net	$ 2,367.4	$ 2,416.5
Other receivables	411.1	464.5
Accounts receivable, net	2,778.5	2,881.0
Securitized accounts receivable	372.2	322.0
Receivables Facility
Revenue Recognition And Accounts Receivable [Line Items]
Accounts receivable securitization facility maximum borrowing capacity	400.0
Variable Consideration [Member]
Revenue Recognition And Accounts Receivable [Line Items]
Trade receivables, net	1,556.2	1,715.6
Other receivables	604.1	626.7
Accounts receivable, net	$ 2,160.3	$ 2,342.3