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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.

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