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Investments (Details 3) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Mar. 31, 2012
Equity securities
Dec. 31, 2011
Equity securities
Summary of the cost, gross unrealized gains and losses and fair value of investments classified as trading securities          
Cost       $ 9.6 $ 13.5
Gross Unrealized Gains       11.5 0.9
Gross Unrealized Losses         (0.3)
Fair Value       21.1 14.1
Summary of the Company's realized gains and losses on investments classified as trading securities          
Gains 0.5 0.2      
Losses (0.3) (0.3)      
Net realized gains (losses) 0.2 (0.1)      
Cost Method Investments          
Value of cost method investments 14.6   14.6    
Other Investments          
Other investments 157.0   145.3    
Other investments reported within Prepaid expenses and other current assets 37.4   31.2    
Other investments reported within Other assets $ 119.6   $ 114.1