Reserves for Discounts and Allowances (Details) $ in Millions	6 Months Ended
	Jun. 30, 2017 USD ($)
Analysis of the amount of, and change in, reserves
Balance as of December 31, 2016	$ 605.5
Current provisions relating to sales in current year	1,412.1
Adjustments relating to prior years	1.5
Payments/credits relating to sales in current year	(836.4)
Payments/credits relating to sales in prior years	(458.4)
Balance as of June 30, 2017	724.3
Discounts
Analysis of the amount of, and change in, reserves
Balance as of December 31, 2016	71.6
Current provisions relating to sales in current year	276.9
Adjustments relating to prior years	(0.2)
Payments/credits relating to sales in current year	(186.5)
Payments/credits relating to sales in prior years	(67.6)
Balance as of June 30, 2017	94.2
Contractual Adjustments
Analysis of the amount of, and change in, reserves
Balance as of December 31, 2016	482.7
Current provisions relating to sales in current year	1,120.0
Adjustments relating to prior years	10.1
Payments/credits relating to sales in current year	(649.9)
Payments/credits relating to sales in prior years	(379.1)
Balance as of June 30, 2017	583.8
Returns
Analysis of the amount of, and change in, reserves
Balance as of December 31, 2016	51.2
Current provisions relating to sales in current year	15.2
Adjustments relating to prior years	(8.4)
Payments/credits relating to sales in current year	0.0
Payments/credits relating to sales in prior years	(11.7)
Balance as of June 30, 2017	$ 46.3