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Defined Benefit Pension Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2017
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]          
Service cost $ 1.4 $ 1.2 $ 2.7 $ 2.4  
Interest cost 3.3 3.3 6.5 6.7  
Expected return on plan assets (3.3) (3.3) (6.5) (6.7)  
Amortization of prior service cost 1 0.2 0.1 0.4 [1] 0.2  
Amortization of net loss 1 1.4 1.4 2.8 [1] 2.8  
Net periodic pension cost $ 3.0 $ 2.7 5.9 $ 5.4  
Payment for Pension Benefits     $ 6.6    
Minimum [Member] | Scenario, Forecast [Member]          
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]          
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year         $ 3.0
Maximum [Member] | Scenario, Forecast [Member]          
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]          
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year         $ 5.0
[1] The amounts reclassified from accumulated other comprehensive income (loss) are included in the computation of net periodic pension cost; see Note 12 for additional details. The net periodic pension cost is included in Cost of sales and Selling and administrative expense in the Consolidated Statements of Income.