Revenue Reserves (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Analysis of the amount of, and change in, reserves
Beginning balance	$ 237.1	$ 155.6	$ 142.0
Current provisions relating to sales in current year	1,110.6	652.7	472.1
Adjustments relating to prior years	(16.0)	(5.1)	(14.9)
Payments/returns relating to sales in current year	(750.1)	(451.1)	(350.7)
Payments/returns relating to sales in prior years	(165.3)	(115.0)	(92.9)
Ending balance	416.3	237.1	155.6
Discounts
Analysis of the amount of, and change in, reserves
Beginning balance	14.3	11.9	13.9
Current provisions relating to sales in current year	236.3	96.5	84.3
Adjustments relating to prior years	(0.7)	(0.3)	0
Payments/returns relating to sales in current year	(189.7)	(83.6)	(73.3)
Payments/returns relating to sales in prior years	(13.2)	(10.2)	(13.0)
Ending balance	47.0	14.3	11.9
Contractual Adjustments
Analysis of the amount of, and change in, reserves
Beginning balance	196.0	120.0	107.0
Current provisions relating to sales in current year	851.4	534.2	372.1
Adjustments relating to prior years	(16.4)	(4.7)	(14.0)
Payments/returns relating to sales in current year	(560.4)	(363.2)	(277.0)
Payments/returns relating to sales in prior years	(135.0)	(90.3)	(68.1)
Ending balance	335.6	196.0	120.0
Returns
Analysis of the amount of, and change in, reserves
Beginning balance	26.8	23.7	21.1
Current provisions relating to sales in current year	22.9	22.0	15.7
Adjustments relating to prior years	1.1	(0.1)	(0.9)
Payments/returns relating to sales in current year	0	(4.3)	(0.4)
Payments/returns relating to sales in prior years	(17.1)	(14.5)	(11.8)
Ending balance	$ 33.7	$ 26.8	$ 23.7