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Fair Value Measurements (Details) - USD ($) $ in Millions | Sep. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | $ 4.4 | $ 4.6 | $ 4.5 | $ 3.7
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Business Combination, Contingent Consideration, Liability | 0.2 | 0.2 | $ 3.8 | $ 3.8
Fair Value, Measurements, Recurring [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available for sale securities | 4.4 | 4.6 |  |
Trading securities | 2.2 | 2.3 |  |
Business Combination, Contingent Consideration, Liability | 0.2 | 0.2 |  |
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available for sale securities | 0.0 | 0.0 |  |
Trading securities | 2.2 | 2.3 |  |
Business Combination, Contingent Consideration, Liability | 0.0 | 0.0 |  |
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available for sale securities | 0.0 | 0.0 |  |
Trading securities | 0.0 | 0.0 |  |
Business Combination, Contingent Consideration, Liability | 0.0 | 0.0 |  |
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available for sale securities | 4.4 | 4.6 |  |
Trading securities | 0.0 | 0.0 |  |
Business Combination, Contingent Consideration, Liability | 0.2 | 0.2 |  |
Senior Secured Notes Maturing 2020 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Notes Payable, Fair Value Disclosure | $ 372.6 | $ 371.0 |  |

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