Accounts Receivable, Net (Summary of Reserve for Discounts and Allowances) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Provision for discounts and doubtful accounts
As of January 1,	$ 169.6	$ 55.8
Provision charged to operations	1,074.1	569.9
Payments/credits	(1,000.0)	(498.3)
As of September 30,	$ 243.7	$ 127.4