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Fair Value Measurements - Summary of Assets and Liabilities at Fair Value (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Financial Assets      
Trading securities $ 23.0   $ 22.5
Available-for-sale securities 113.0   135.4
Other investments 220.7   214.1
Financial Liabilities      
Collateral posted 3.3   3.6
Gain on interest rate swap 0.3 0.3  
Fair value measured on a recurring basis [Member] | Fair value [Member]
      
Financial Assets      
Cash equivalents 37.7   39.0
Trading securities 23.0 [1]   22.5 [1]
Available-for-sale securities 113.0 [1]   135.4 [1]
Other investments 169.7   164.3
Financial Liabilities      
Contingent payment arrangements 53.2 [2]   50.2 [2]
Obligations to related parties 131.9 [2]   76.9 [2]
Interest rate derivatives 2.2 [3]   2.5 [3]
Fair value measured on a recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
      
Financial Assets      
Cash equivalents 37.7   39.0
Trading securities 23.0 [1]   22.5 [1]
Available-for-sale securities 113.0 [1]   135.4 [1]
Other investments 14.6   14.1
Financial Liabilities      
Contingent payment arrangements 0 [2]   0 [2]
Obligations to related parties 0 [2]   0 [2]
Interest rate derivatives 0 [3]   0 [3]
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 19.2   18.4
Financial Liabilities      
Contingent payment arrangements 0 [2]   0 [2]
Obligations to related parties 0 [2]   0 [2]
Interest rate derivatives 2.2 [3]   2.5 [3]
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 135.9   131.8
Financial Liabilities      
Contingent payment arrangements 53.2 [2]   50.2 [2]
Obligations to related parties 131.9 [2]   76.9 [2]
Interest rate derivatives $ 0 [3]   $ 0 [3]
[1] Principally investments in equity securities.
[2] Amounts are presented within Other liabilities in the accompanying Consolidated Balance Sheets.
[3] The fair value of the Company's interest rate swaps are presented within Other liabilities in the accompanying Consolidated Balance Sheets. As of December 31, 2013 and March 31, 2014, the Company had posted collateral with its counterparties of $3.6 million and $3.3 million, respectively. For the three months ended March 31, 2013 and 2014, gains on these interest rate swaps ($0.3 million and $0.3 million, respectively) have been reported in the Consolidated Statements of Comprehensive Income.