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Fair Value Measurements (Debt) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Fair Value    
Credit facility term loan $ 83.2 $ 85.0
Credit facility term loan, fair value 93.5 72.8
OtherLongTermDebtCurrent 100.5 88.6
Notes Payable, Fair Value Disclosure 100.5 88.6
Convertible senior notes 530.0 530.0
Convertible senior notes, fair value $ 198.2 $ 246.1