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Effect of New Accounting Standards (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
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