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Investments in Marketable Securities (Details 2) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Available-for-Sale          
Cost $ 102.8   $ 102.8   $ 103.2
Unrealized Gains 4.1   4.1   15.3
Unrealized Losses (7.3)   (7.3)   (3.2)
Fair Value 99.6   99.6   115.3
Trading          
Cost 18.1   18.1   10.3
Unrealized Gains     2.4   6.5
Unrealized Losses     0   (3.2)
Fair Value 20.5   20.5   13.6
Realized gains and losses on investments classified as available-for-sale          
Gains 1.9 0 2.1 0  
Losses 0 0 0 0  
Net realized gains 1.9 0 2.1 0  
Realized gains and losses on investments classified as trading          
Gains 0.3 0.1 0.4 0.6  
Losses 0 0 0 (0.3)  
Net realized gains $ 0.3 $ 0.1 $ 0.4 $ 0.3