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Fair Value Measurements - Schedule of Fair Value of Assets and Liabilities Measured on a Recurring Basis (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Financial Assets          
Trading securities $ 22.1   $ 22.1   $ 22.5
Other investments 218.7   218.7   214.1
Financial Liabilities          
Collateral posted 3.0   3.0   3.6
Gain on interest rate swap 0.5 0 0.9 1.3  
Fair Value Measured On A Recurring Basis | Fair Value
          
Financial Assets          
Cash equivalents 32.4   32.4   39.0
Trading securities 22.1 [1]   22.1 [1]   22.5 [1]
Available-for-sale securities 136.0 [1]   136.0 [1]   135.4 [1]
Other investments 171.1   171.1   164.3
Financial Liabilities          
Contingent payment arrangements 57.0 [2]   57.0 [2]   50.2 [2]
Obligations to related parties 92.7 [2]   92.7 [2]   76.9 [2]
Interest rate derivatives 1.6 [3]   1.6 [3]   2.5 [3]
Fair Value Measured On A Recurring Basis | Quoted Prices In Active Markets For Identical Assets (Level 1)
          
Financial Assets          
Cash equivalents 32.4   32.4   39.0
Trading securities 22.1 [1]   22.1 [1]   22.5 [1]
Available-for-sale securities 136.0 [1]   136.0 [1]   135.4 [1]
Other investments 20.3   20.3   14.1
Financial Liabilities          
Contingent payment arrangements 0 [2]   0 [2]   0 [2]
Obligations to related parties 0 [2]   0 [2]   0 [2]
Interest rate derivatives 0 [3]   0 [3]   0 [3]
Fair Value Measured On A Recurring Basis | Significant Other Observable Inputs (Level 2)
          
Financial Assets          
Cash equivalents 0   0   0
Trading securities 0 [1]   0 [1]   0 [1]
Available-for-sale securities 0 [1]   0 [1]   0 [1]
Other investments 13.1   13.1   18.4
Financial Liabilities          
Contingent payment arrangements 0 [2]   0 [2]   0 [2]
Obligations to related parties 0 [2]   0 [2]   0 [2]
Interest rate derivatives 1.6 [3]   1.6 [3]   2.5 [3]
Fair Value Measured On A Recurring Basis | Significant Other Unobservable Inputs (Level 3)
          
Financial Assets          
Cash equivalents 0   0   0
Trading securities 0 [1]   0 [1]   0 [1]
Available-for-sale securities 0 [1]   0 [1]   0 [1]
Other investments 137.7   137.7   131.8
Financial Liabilities          
Contingent payment arrangements 57.0 [2]   57.0 [2]   50.2 [2]
Obligations to related parties 92.7 [2]   92.7 [2]   76.9 [2]
Interest rate derivatives $ 0 [3]   $ 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 is presented within Other liabilities in the accompanying Consolidated Balance Sheets. As of December 31, 2013 and September 30, 2014, the Company had posted collateral with its counterparties of $3.6 million and $3.0 million, respectively. Gains (losses) on these interest rate swaps for the three and nine months ended September 30, 2013 were $(0.0) million and $1.3 million, respectively, and $0.5 million and $0.9 million, respectively, for the three and nine months ended September 30, 2014. These gains have been reported in the Consolidated Statements of Comprehensive Income.