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Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Financial Assets    
Other investments $ 187.8 $ 150.6
Fair value measured on a recurring basis | Fair value
   
Financial Assets    
Cash equivalents 13.5 23.2
Trading securities 13.6 14.1
Available-for-sale securities 115.3 86.3
Other investments 155.4 145.3
Financial Liabilities    
Contingent payment arrangements 31.0 87.1
Obligations to related parties 77.8 92.0
Interest rate derivatives 4.0 2.9
Fair value measured on a recurring basis | Level 1
   
Financial Assets    
Cash equivalents 13.5 23.2
Trading securities 13.6 14.1
Available-for-sale securities 115.3 86.3
Other investments 15.7 31.1
Fair value measured on a recurring basis | Level 2
   
Financial Assets    
Other investments 20.8 10.8
Financial Liabilities    
Interest rate derivatives 4.0 2.9
Fair value measured on a recurring basis | Level 3
   
Financial Assets    
Other investments 118.9 103.4
Financial Liabilities    
Contingent payment arrangements 31.0 87.1
Obligations to related parties $ 77.8 $ 92.0