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Income Taxes (Details) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2015 USD ($) Country | Sep. 30, 2014 | Sep. 30, 2015 USD ($) Country | Sep. 30, 2014 | Dec. 31, 2015 | Dec. 31, 2014 USD ($)
Income Tax Disclosure [Abstract] |  |  |  |  |  |
Effective income tax rate (as percent) | 37.10% | 35.50% | 38.60% | 37.90% |  |
U.S. Federal statutory rate (as percent) | 35.00% |  | 35.00% |  |  |
Gross unrecognized tax benefits, including interest and penalties | $ 32.7 |  | $ 32.7 |  |  | $ 30.8
Related tax benefits | 1.4 |  | 1.4 |  |  | 1.4
Net unrecognized tax benefits | $ 31.3 |  | $ 31.3 |  |  | $ 29.4
Number of countries and territories in which the Company operates | Country | 80 |  | 80 |  |  |
Forecast |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |
Expected annual effective income tax rate (as percent) |  |  |  |  | 38.00% |

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