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Fair Value Measurements - Schedule of Fair Value of Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Investments in marketable securities    
Trading securities $ 24.4 $ 22.3
Other investments 220.9 210.0
Fair Value Measured On A Recurring Basis    
Financial Assets    
Cash equivalents 37.8 59.1
Investments in marketable securities    
Trading securities [1] 24.4 22.3
Available-for-sale securities [1] 237.1 150.3
Other investments 165.7 167.2
Foreign currency forward contracts 1.5  
Financial Liabilities    
Contingent payment arrangements [2] 6.7 59.3
Obligations to related parties [2] 127.3 93.1
Interest rate derivatives 0.9 1.4
Foreign currency forward contracts 0.2 0.5
Fair Value Measured On A Recurring Basis | Quoted Prices In Active Markets For Identical Assets (Level 1)    
Financial Assets    
Cash equivalents 37.8 59.1
Investments in marketable securities    
Trading securities [1] 24.4 22.3
Available-for-sale securities [1] 237.1 150.3
Other investments 24.3 13.6
Foreign currency forward contracts 0.0  
Financial Liabilities    
Contingent payment arrangements [2] 0.0 0.0
Obligations to related parties [2] 0.0 0.0
Interest rate derivatives 0.0 0.0
Foreign currency forward contracts 0.0 0.0
Fair Value Measured On A Recurring Basis | Significant Other Observable Inputs (Level 2)    
Financial Assets    
Cash equivalents 0.0 0.0
Investments in marketable securities    
Trading securities [1] 0.0 0.0
Available-for-sale securities [1] 0.0 0.0
Other investments 8.0 19.4
Foreign currency forward contracts 1.5  
Financial Liabilities    
Contingent payment arrangements [2] 0.0 0.0
Obligations to related parties [2] 0.0 0.0
Interest rate derivatives 0.9 1.4
Foreign currency forward contracts 0.2 0.5
Fair Value Measured On A Recurring Basis | Significant Other Unobservable Inputs (Level 3)    
Financial Assets    
Cash equivalents 0.0 0.0
Investments in marketable securities    
Trading securities [1] 0.0 0.0
Available-for-sale securities [1] 0.0 0.0
Other investments 133.4 134.2
Foreign currency forward contracts 0.0  
Financial Liabilities    
Contingent payment arrangements [2] 6.7 59.3
Obligations to related parties [2] 127.3 93.1
Interest rate derivatives 0.0 0.0
Foreign currency forward contracts $ 0.0 $ 0.0
[1] Principally investments in equity securities.
[2] Amounts are presented within Other liabilities in the accompanying Consolidated Balance Sheets.