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Employee Benefit Plans (Net Funded Status) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Change in plan assets      
Fair value of plan assets at beginning of year $ 601.7    
Fair value of plan assets at end of year   $ 601.7  
Unrecognized net actuarial losses 380.6 404.8 $ 336.6
Amounts recognized in Consolidated Balance Sheets:      
Pensions and postretirement health care benefits (noncurrent) (247.3) (270.0)  
Pension Benefits      
Change in benefit obligation      
Benefit obligation, beginning of period 849.8 844.4  
Service cost 17.1 16.2 18.7
Interest cost 20.6 24.6 31.2
Plan participants’ contributions 1.1 1.1  
Actuarial losses 0.5 121.9  
Amendments 0.0 3.3  
Settlements (0.7) (3.8)  
Curtailments 0.0 (0.4)  
Benefits paid (42.6) (44.1)  
Foreign currency exchange rate changes 70.9 (113.4)  
Benefit obligation, end of period 916.7 849.8 844.4
Change in plan assets      
Fair value of plan assets at beginning of year 601.7 630.7  
Actual return on plan assets 47.3 84.4  
Employer contributions 30.3 31.3  
Plan participants’ contributions 1.1 1.1  
Benefits paid (42.6) (44.1)  
Settlements (0.7) (3.8)  
Foreign currency exchange rate changes 54.7 (97.9)  
Fair value of plan assets at end of year 691.8 601.7 630.7
Funded status (224.9) (248.1)  
Unrecognized net actuarial losses 360.1 384.7  
Unrecognized prior service cost 12.2 13.4  
Accumulated other comprehensive loss (372.3) (398.1)  
Net amount recognized (224.9) (248.1)  
Amounts recognized in Consolidated Balance Sheets:      
Other current liabilities (3.9) (3.5)  
Accrued expenses (2.3) (1.7)  
Pensions and postretirement health care benefits (noncurrent) (218.7) (242.9)  
Postretirement Benefits      
Change in benefit obligation      
Benefit obligation, beginning of period 28.6 27.3  
Service cost 0.1 0.0 0.0
Interest cost 1.4 1.4 1.3
Plan participants’ contributions 0.0 0.0  
Actuarial losses 1.8 0.6  
Amendments 0.0 0.0  
Settlements 0.0 0.0  
Curtailments 0.0 0.0  
Benefits paid (1.6) (1.2)  
Foreign currency exchange rate changes (0.1) 0.5  
Benefit obligation, end of period 30.2 28.6 27.3
Change in plan assets      
Fair value of plan assets at beginning of year 0.0 0.0  
Actual return on plan assets 0.0 0.0  
Employer contributions 1.6 1.2  
Plan participants’ contributions 0.0 0.0  
Benefits paid (1.6) (1.2)  
Settlements 0.0 0.0  
Foreign currency exchange rate changes 0.0 0.0  
Fair value of plan assets at end of year 0.0 0.0 $ 0.0
Funded status (30.2) (28.6)  
Unrecognized net actuarial losses 3.8 2.0  
Unrecognized prior service cost 3.2 3.4  
Accumulated other comprehensive loss (7.0) (5.4)  
Net amount recognized (30.2) (28.6)  
Amounts recognized in Consolidated Balance Sheets:      
Other current liabilities (1.6) (1.5)  
Accrued expenses 0.0 0.0  
Pensions and postretirement health care benefits (noncurrent) $ (28.6) $ (27.1)