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Fair Value Measurements - Summary of Assets and Liabilities at Fair Value (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Financial Assets    
Trading securities $ 21.9 $ 13.6
Available-for-sale securities 111.0 115.3
Other investments 206.2 187.8
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 32.1 13.5
Trading securities 21.9 [1] 13.6 [1]
Available-for-sale securities 111.0 [1] 115.3 [1]
Other investments 157.9 [2] 155.4 [2]
Financial Liabilities    
Contingent payment arrangements 46.1 [3] 31.0 [3]
Obligations to related parties 98.7 [4] 77.8 [4]
Interest rate derivatives 2.7 [5] 4.0 [5]
Fair value measured on a recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
    
Financial Assets    
Cash equivalents 32.1 13.5
Trading securities 21.9 [1] 13.6 [1]
Available-for-sale securities 111.0 [1] 115.3 [1]
Other investments 13.1 [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] | Significant Other Observable Inputs (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 18.5 [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] | Significant Other Unobservable Inputs (Level 3) [Member]
    
Financial Assets    
Cash equivalents   0
Trading securities   0 [1]
Available-for-sale securities   0 [1]
Other investments 126.3 [2] 118.9 [2]
Financial Liabilities    
Contingent payment arrangements 46.1 [3] 31.0 [3]
Obligations to related parties 98.7 [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.