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Effect of New Accounting Standards (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2015
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Retained earnings |  | $ 398.0 | $ 204.2
New Accounting Pronouncement, Early Adoption, Effect [Member] | Scenario, Forecast [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Deferred tax assets, net | $ 4.8 |  |
Retained earnings | $ 4.8 |  |

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