Reserves for Discounts and Allowances (Details) $ in Millions	3 Months Ended
	Mar. 31, 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	707.1
Adjustments relating to prior years	(4.8)
Payments/credits relating to sales in current year	(294.0)
Payments/credits relating to sales in prior years	(337.3)
Balance as of March 31, 2017	676.5
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	131.3
Adjustments relating to prior years	0.7
Payments/credits relating to sales in current year	(62.3)
Payments/credits relating to sales in prior years	(64.4)
Balance as of March 31, 2017	76.9
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	568.2
Adjustments relating to prior years	0.8
Payments/credits relating to sales in current year	(231.7)
Payments/credits relating to sales in prior years	(267.5)
Balance as of March 31, 2017	552.5
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	7.6
Adjustments relating to prior years	(6.3)
Payments/credits relating to sales in current year	0.0
Payments/credits relating to sales in prior years	(5.4)
Balance as of March 31, 2017	$ 47.1