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Fair Value Measurements (Details 2) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Summary of fair and carrying value of debt instruments    
Notes payable, Carrying Value $ 1,055.1 $ 1,061.9
Notes payable, Fair Value 1,144.9 1,160.4
Notes Payable to Fumedica [Member]
   
Summary of fair and carrying value of debt instruments    
Notes payable, Fair Value 18.9 22.4
Notes payable, Carrying Value 17.2 19.7
6.0% Senior Notes due 2013 [Member]
   
Summary of fair and carrying value of debt instruments    
Notes payable, Fair Value 459.6 474.1
Notes payable, Carrying Value 450.0 449.9
6.875% Senior Notes due 2018 [Member]
   
Summary of fair and carrying value of debt instruments    
Notes payable, Fair Value 666.4 663.9
Notes payable, Carrying Value $ 587.9 $ 592.3