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Income Taxes - Tax Reconciliation (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Before tax        
Income before income taxes $ 53.0 $ 38.5 $ 87.0 $ 61.4
Separation costs 0.2 4.7 0.5 11.1
Restructuring & other (income) charges 1.1 1.0 3.4 5.6
Results of legal entities with full valuation allowances (0.3) (0.9) 1.5 2.8
Total discrete items 1.0 4.8 5.4 19.5
Consolidated and combined operations, before discrete items 54.0 43.3 92.4 80.9
Tax        
Tax 17.2 12.6 28.2 23.8
Separation costs, tax 0.1 1.3 0.2 2.3
Restructuring & other (income) charges, tax   0.2 0.6 1.1
Other tax only discrete items (0.6) (0.1) (0.4) (0.2)
Total discrete items, tax (0.5) 1.4 0.4 3.2
Combined operations, before discrete items, tax $ 16.7 $ 14.0 $ 28.6 $ 27.0
Effective tax rate 32.50% 32.70% 32.40% 38.80%
EAETR 30.90% 32.30% 31.00% 33.40%
Projected decrease in income (as a percent)     70.00%