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Organization and Basis of Presentation Effect of New Accounting Standard - Tax (Narrative) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2016
New Accounting Pronouncement, Early Adoption [Line Items]      
Retained earnings $ 761.0 $ 423.9  
Deferred tax assets, net   352.8  
Restatement Adjustment [Member]      
New Accounting Pronouncement, Early Adoption [Line Items]      
Retained earnings   25.8 $ 25.8
Deferred tax assets, net   $ 11.4 $ 11.4