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Discontinued Operations - Income from Discontinued Operations (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Summarized Financial Information of Discontinued Operations        
Income from discontinued operations, net of tax $ 0.7 $ 2.1 $ 4.7 $ 2.6
Effective income tax rate (percent) 16.00% 100.00% 20.60% 120.00%
Held-for-sale        
Summarized Financial Information of Discontinued Operations        
Sales $ 43.0 $ 37.8 $ 120.6 $ 109.3
Cost of sales 31.3 25.3 87.1 78.5
Selling, general and administrative expenses 6.8 8.6 21.4 25.5
Amortization expense 0.6 0.7 1.8 2.2
Operating income 4.3 3.2 10.3 3.1
Other expense 0.4   0.6  
Other (income)   (0.1)   (1.2)
Income before income taxes 3.9 3.3 9.7 4.3
Income tax expense 3.2 1.2 5.0 1.7
Income from discontinued operations, net of tax 0.7 2.1 4.7 2.6
Depreciation expense, discontinued operations $ 0.4 $ 0.4 $ 1.3 $ 1.2
Effective income tax rate (percent) 82.10% 36.40% 51.50% 39.50%