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Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Financial Assets    
Trading securities $ 20.5 $ 13.6
Available-for-sale securities 99.6 115.3
Other investments 197.5 187.8
Fair value measured on a recurring basis [Member]
   
Financial Assets    
Cash equivalents 0  
Trading securities 0 [1]  
Available-for-sale securities 0 [1]  
Fair value measured on a recurring basis [Member] | Fair value [Member]
   
Financial Assets    
Cash equivalents 20.4 13.5
Trading securities 20.5 [1] 13.6 [1]
Available-for-sale securities 99.6 [1] 115.3 [1]
Other investments 152.8 [2] 155.4 [2]
Financial Liabilities    
Contingent payment arrangements 44.3 [3] 31.0 [3]
Obligations to related parties 96.6 [4] 77.8 [4]
Interest rate derivatives 2.7 [5] 4.0 [5]
Fair value measured on a recurring basis [Member] | Level 1 [Member]
   
Financial Assets    
Cash equivalents 20.4 13.5
Trading securities 20.5 [1] 13.6 [1]
Available-for-sale securities 99.6 [1] 115.3 [1]
Other investments 11.7 [2] 15.7 [2]
Financial Liabilities    
Contingent payment arrangements 0 [3] 0 [3]
Obligations to related parties 0 [4] 0 [4]
Interest rate derivatives 0 [5] 0 [5]
Fair value measured on a recurring basis [Member] | Level 2 [Member]
   
Financial Assets    
Cash equivalents 0 0
Trading securities 0 [1] 0 [1]
Available-for-sale securities 0 [1] 0 [1]
Other investments 16.7 [2] 20.8 [2]
Financial Liabilities    
Contingent payment arrangements 0 [3] 0 [3]
Obligations to related parties 0 [4] 0 [4]
Interest rate derivatives 2.7 [5] 4.0 [5]
Fair value measured on a recurring basis [Member] | Level 3 [Member]
   
Financial Assets    
Cash equivalents   0
Trading securities   0 [1]
Available-for-sale securities   0 [1]
Other investments 124.4 [2] 118.9 [2]
Financial Liabilities    
Contingent payment arrangements 44.3 [3] 31.0 [3]
Obligations to related parties 96.6 [4] 77.8 [4]
Interest rate derivatives $ 0 [5] $ 0 [5]
[1] Principally investments in equity securities.
[2] Other investments are reported within Prepaid expenses and other current assets and Other assets.
[3] Net present value of expected payments under contingent payment arrangements are reported in Accounts payable and accrued liabilities and Other long-term liabilities.
[4] Obligations to related parties are presented within Payables to related party and Other long-term liabilities.
[5] Interest rate derivatives are presented within Other long-term liabilities.