Reserves for Discounts and Allowances (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Analysis of the amount of, and change in, reserves
Balance, as of December 31, 2013	$ 416.3
Current provisions relating to sales in current year	378.5
Adjustments relating to prior years	0.9
Payments/returns relating to sales in current year	(122.2)
Payments/returns relating to sales in prior years	(208.5)
Balance, as of March 31, 2014	465.0
Discounts
Analysis of the amount of, and change in, reserves
Balance, as of December 31, 2013	47.0
Current provisions relating to sales in current year	78.2
Adjustments relating to prior years	(1.4)
Payments/returns relating to sales in current year	(30.7)
Payments/returns relating to sales in prior years	(41.2)
Balance, as of March 31, 2014	51.9
Contractual Adjustments
Analysis of the amount of, and change in, reserves
Balance, as of December 31, 2013	335.6
Current provisions relating to sales in current year	293.2
Adjustments relating to prior years	(2.1)
Payments/returns relating to sales in current year	(91.4)
Payments/returns relating to sales in prior years	(159.0)
Balance, as of March 31, 2014	376.3
Returns
Analysis of the amount of, and change in, reserves
Balance, as of December 31, 2013	33.7
Current provisions relating to sales in current year	7.1
Adjustments relating to prior years	4.4
Payments/returns relating to sales in current year	(0.1)
Payments/returns relating to sales in prior years	(8.3)
Balance, as of March 31, 2014	$ 36.8