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Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 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 18.7 23.2
Trading securities 21.1 14.1
Available-for-sale securities 88.8 86.3
Other investments 153.6 145.3
Financial Liabilities    
Contingent payment arrangements 66.0 87.1
Obligations to related parties 75.8 92.0
Interest rate derivatives 4.3 2.9
Fair value measured on a recurring basis | Level 1
   
Financial Assets    
Cash equivalents 18.7 23.2
Trading securities 21.1 14.1
Available-for-sale securities 88.8 86.3
Other investments 18.2 31.1
Fair value measured on a recurring basis | Level 2
   
Financial Assets    
Other investments 18.7 10.8
Financial Liabilities    
Interest rate derivatives 4.3 2.9
Fair value measured on a recurring basis | Level 3
   
Financial Assets    
Other investments 116.7 103.4
Financial Liabilities    
Contingent payment arrangements 66.0 87.1
Obligations to related parties $ 75.8 $ 92.0