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Investments (Details 3) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Jun. 30, 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           $ 8.2 $ 13.5
Gross Unrealized Gains           11.2 0.9
Gross Unrealized Losses           (0.1) (0.3)
Fair Value           19.3 14.1
Summary of the Company's realized gains and losses on investments classified as trading securities              
Gains 0.1   0.6 0.4      
Losses   (0.1) (0.3) (0.4)      
Net realized gains (losses) 0.1 (0.1) 0.3        
Other Investments              
Other investments 156.7   156.7   145.3    
Other investments reported within Prepaid expenses and other current assets 32.6   32.6   31.2    
Other investments reported within Other assets $ 124.1   $ 124.1   $ 114.1