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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