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Income Taxes (Details) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended | 24 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 | Dec. 31, 2014 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Sep. 30, 2017 USD ($) item
Income tax examinations |  |  |  |  |  |  |  |  |  |
Discrete income tax benefit | $ 1.3 |  |  | $ 5.1 |  |  |  |  |  |
Effective tax rate |  |  |  |  |  |  |  |  |  |
Effective income tax rate (as a percent) | (2507.15%) | (25.56%) |  | (1232.94%) | 8.00% |  |  |  |  |
Deferred tax assets and liabilities |  |  |  |  |  |  |  |  |  |
Reduction in valuation allowance |  |  |  | $ 766.2 |  |  |  |  |  |
Net deferred tax assets | $ 635.9 |  |  | 635.9 |  |  |  |  |  | $ 635.9
Net deferred income tax liability |  |  |  |  |  | $ 126.9 |  |  |  |
Valuation allowance | 77.1 |  |  | 77.1 |  |  |  |  |  | $ 77.1
Three year cumulative pretax income (loss) | 76.6 |  |  |  |  |  |  |  |  |
Pretax income (loss) |  |  | $ (161.5) |  |  |  |  |  |  |
Impairment charges |  |  | $ 155.3 |  |  |  |  |  |  |
Number of quarters with substantial pretax income in the past eight quarters | item |  |  |  |  |  |  |  |  |  | 7
Goodwill and intangible asset impairment charges |  |  |  | 29.9 |  | $ 0.0 | $ 40.0 | $ 159.9 | $ 798.3 |
Canadian Revenue Agency |  |  |  |  |  |  |  |  |  |
Income tax examinations |  |  |  |  |  |  |  |  |  |
Refund from tax audit settlement | $ 29.7 |  |  | $ 29.7 |  |  |  |  |  | $ 29.7

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