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Investments (Details 3) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Sep. 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           $ 11.4 $ 13.5
Gross Unrealized Gains           10.8 0.9
Gross Unrealized Losses           (1.1) (0.3)
Fair Value           21.1 14.1
Summary of the Company's realized gains and losses on investments classified as trading securities              
Gains 0.2 0.1 0.8 0.5      
Losses     (0.3) (0.3)      
Net realized gains 0.2 0.1 0.5 0.2      
Other Investments              
Other investments 153.6   153.6   145.3    
Other investments reported within Prepaid expenses and other current assets 23.3   23.3   31.2    
Other investments reported within Other assets $ 130.3   $ 130.3   $ 114.1