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Fair Value Measurements (Details) (USD $)
In Millions
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Fair Value, Measurements, Recurring [Member]
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
Sep. 30, 2011
Fair Value, Measurements, Recurring [Member]
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Sep. 30, 2011
Fair Value, Measurements, Recurring [Member]
Significant Other Observable Inputs (Level 2) [Member]
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
Significant Other Observable Inputs (Level 2) [Member]
Sep. 30, 2011
Fair Value, Measurements, Recurring [Member]
Significant Unobservable Inputs (Level 3) [Member]
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Par Value Available For Sale Security Sold$ 38.1           
Proceeds from Sale of Available-for-sale Securities19.1019.10        
Assets, Fair Value Disclosure [Abstract]            
Available for sale securities    0.515.40003.80.511.6
Trading securities    2.62.62.62.60000
Total    $ 3.1$ 18.0$ 2.6$ 2.6$ 0$ 3.8$ 0.5$ 11.6