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Fair Value Measurements - Schedule of fair value of financial assets and liabilities measured on a recurring basis (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Financial Assets    
Other investments $ 214.1 $ 187.8
Financial Liabilities    
Level 1 to Level 2 transfers 0 2.0
Fair value measured on a recurring basis [Member] | Fair value [Member]
   
Financial Assets    
Cash equivalents 39.0 13.5
Trading securities 22.5 [1] 13.6 [1]
Available-for-sale securities 135.4 [1] 115.3 [1]
Other investments 164.3 155.4
Financial Liabilities    
Contingent payment arrangements 50.2 [2] 31.0 [2]
Obligations to related parties 76.9 [3] 77.8 [3]
Interest rate derivatives 2.5 [4] 4.0 [4]
Fair value measured on a recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
   
Financial Assets    
Cash equivalents 39.0 13.5
Trading securities 22.5 [1] 13.6 [1]
Available-for-sale securities 135.4 [1] 115.3 [1]
Other investments 14.1 15.7
Financial Liabilities    
Contingent payment arrangements 0 [2] 0 [2]
Obligations to related parties 0 [3] 0 [3]
Interest rate derivatives 0 [4] 0 [4]
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 18.4 20.8
Financial Liabilities    
Contingent payment arrangements 0 [2] 0 [2]
Obligations to related parties 0 [3] 0 [3]
Interest rate derivatives 2.5 [4] 4.0 [4]
Fair value measured on a recurring basis [Member] | Significant Other Unobservable Inputs (Level 3) [Member]
   
Financial Assets    
Cash equivalents 0 0
Trading securities 0 [1] 0 [1]
Available-for-sale securities 0 [1] 0 [1]
Other investments 131.8 118.9
Financial Liabilities    
Contingent payment arrangements 50.2 [2] 31.0 [2]
Obligations to related parties 76.9 [3] 77.8 [3]
Interest rate derivatives $ 0 [4] $ 0 [4]
[1] Principally investments in equity securities.
[2] Net present value of expected payments under contingent payment arrangements are reported in Other liabilities.
[3] Obligations to related parties are presented within Other liabilities.
[4] Interest rate derivatives are presented within Other liabilities.