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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Jun. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Effective income tax rate on continuing operations (as a percent) |  |  | 33.00% | 33.50% | 42.50%
Anticipated effective tax rate for beginning of year to date (as a percent) |  |  |  | 33.60% |
Discrete tax expense (benefit) related to state valuation allowance release |  |  |  | $ 0.3 | $ 0.8
Expenses from net foreign exchange gains |  |  |  | 4.2 |
Impairment charges | $ 0.0 | $ 141.5 |  | 0.0 | 141.5
Income tax benefit related to impairment charges |  |  |  |  | $ 8.9
Accounting Standards Update 2016-09 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Discrete income tax benefit | $ 0.2 |  |  | $ 3.7 |

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- Definition A ratio calculated by dividing the reported amount of expected income tax expense attributable to continuing operations for the period by GAAP-basis expected pretax income from continuing operations. + References No definition available. + Details
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