Revenue Reserves (Details 1) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Summary of total product revenue reserves included in consolidated balance sheets
Reduction of accounts receivable	$ 46.1	$ 40.6
Current liability	191.0	115.0
Total reserves	$ 237.1	$ 155.6	$ 142.0	$ 103.1