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Basis of Presentation Prior Period Corrections (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Quantifying Misstatement in Current Year Financial Statements        
Earnings (loss) before income taxes and discontinued operations $ 5.8 $ (24.2) $ 6.2 $ (29.7)
Restatement Adjustment | Nonrecurring Adjustment        
Quantifying Misstatement in Current Year Financial Statements        
Earnings (loss) before income taxes and discontinued operations     (1.3)  
Restatement Adjustment | Inventory Valuation Reserve        
Quantifying Misstatement in Current Year Financial Statements        
Earnings (loss) before income taxes and discontinued operations     $ 0.7  
Restatement Adjustment | Incentive Compensation Accrual        
Quantifying Misstatement in Current Year Financial Statements        
Earnings (loss) before income taxes and discontinued operations       $ 1.1