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Investments in Marketable Securities (Details 2) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Available-for-Sale          
Cost $ 104.0   $ 104.0   $ 103.2
Unrealized Gains 9.5   9.5   15.3
Unrealized Losses (2.5)   (2.5)   (3.2)
Fair Value 111.0   111.0   115.3
Trading          
Cost 18.2   18.2   10.3
Unrealized Gains     3.7   6.5
Unrealized Losses     0   (3.2)
Fair Value 21.9   21.9   13.6
Realized gains and losses on investments classified as available-for-sale          
Gains 0 0.1 2.1 0.1  
Losses 0 0 0 0  
Net realized gains 0 0.1 2.1 0.1  
Realized gains and losses on investments classified as trading          
Gains 0.2 0.2 0.6 0.8  
Losses 0 0 0 (0.3)  
Net realized gains $ 0.2 $ 0.2 $ 0.6 $ 0.5