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Investments (Details 3) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Summary of the Company's realized gains and losses on investments classified as trading securities      
Gains $ 1.5 $ 0.9 $ 0.5
Losses (0.3) (0.7)  
Net realized gains 1.2 0.2 0.5
Other Investments      
Other investments 155.4 145.3  
Other investments reported within Prepaid expenses and other current assets 21.5 31.2  
Other investments reported within Other assets 133.9 114.1  
Equity securities
     
Summary of the cost, gross unrealized gains and losses and fair value of investments classified as trading securities      
Cost 10.3 13.5  
Gross Unrealized Gains 6.5 0.9  
Gross Unrealized Losses (3.2) (0.3)  
Fair Value $ 13.6 $ 14.1