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Fair Value Measurements (Debt) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Fair Value    
Credit facility term loan $ 85.0 $ 85.0
Credit facility term loan, fair value 93.0 72.8
Convertible preferred stock 97.4 88.6
Convertible preferred stock, fair value 97.4 88.6
Convertible senior notes 530.0 530.0
Convertible senior notes, fair value $ 219.6 $ 246.1