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Fair Value Measurements (Debt) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Fair Value    
Credit facility term loan   $ 83.2
Credit facility term loan, fair value   93.5
Convertible preferred stock 103.7 100.5
Convertible preferred stock, fair value 103.7 100.5
Convertible senior notes 530.0 530.0
Convertible senior notes, fair value $ 182.9 $ 198.2