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Employee Benefit Plans (Net Funded Status) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Change in plan assets      
Fair value of plan assets at beginning of year $ 691.8    
Fair value of plan assets at end of year   $ 691.8  
Unrecognized net actuarial losses (gains) 379.8 380.6 $ 404.8
Amounts recognized in Consolidated Balance Sheets:      
Pensions and postretirement health care benefits (noncurrent) (223.2) (247.3)  
Pension Benefits      
Change in benefit obligation      
Benefit obligation, beginning of period 916.7 849.8  
Service cost 16.6 17.1 16.2
Interest cost 19.9 20.6 24.6
Plan participants’ contributions 1.2 1.1  
Actuarial (gains) losses (55.2) 0.5  
Amendments 8.5 0.0  
Settlements (1.5) (0.7)  
Benefits paid (45.9) (42.6)  
Defined Benefit Plan, Special Termination Benefits and Other 1.9 0.0  
Foreign currency exchange rate changes (39.1) 70.9  
Benefit obligation, end of period 823.1 916.7 849.8
Change in plan assets      
Fair value of plan assets at beginning of year 691.8 601.7  
Actual return on plan assets (32.4) 47.3  
Employer contributions 36.8 30.3  
Plan participants’ contributions 1.2 1.1  
Benefits paid (45.9) (42.6)  
Settlements (1.5) (0.7)  
Foreign currency exchange rate changes (32.9) 54.7  
Fair value of plan assets at end of year 617.1 691.8 601.7
Funded status (206.0) (224.9)  
Unrecognized net actuarial losses (gains) 356.7 360.1  
Unrecognized prior service cost 19.5 12.2  
Accumulated other comprehensive loss (376.2) (372.3)  
Net amount recognized (206.0) (224.9)  
Amounts recognized in Consolidated Balance Sheets:      
Assets for Plan Benefits, Defined Benefit Plan 0.1 0.0  
Other current liabilities (3.8) (3.9)  
Accrued expenses (2.9) (2.3)  
Pensions and postretirement health care benefits (noncurrent) (199.4) (218.7)  
Postretirement Benefits      
Change in benefit obligation      
Benefit obligation, beginning of period 30.2 28.6  
Service cost 0.1 0.1 0.0
Interest cost 1.4 1.4 1.4
Plan participants’ contributions 0.0 0.0  
Actuarial (gains) losses (4.2) 1.8  
Amendments 0.0 0.0  
Settlements 0.0 0.0  
Benefits paid (1.4) (1.6)  
Defined Benefit Plan, Special Termination Benefits and Other 0.0 0.0  
Foreign currency exchange rate changes (0.8) (0.1)  
Benefit obligation, end of period 25.3 30.2 28.6
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 1.4 1.6  
Plan participants’ contributions 0.0 0.0  
Benefits paid (1.4) (1.6)  
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 (25.3) (30.2)  
Unrecognized net actuarial losses (gains) (0.6) 3.8  
Unrecognized prior service cost 3.1 3.2  
Accumulated other comprehensive loss (2.5) (7.0)  
Net amount recognized (25.3) (30.2)  
Amounts recognized in Consolidated Balance Sheets:      
Assets for Plan Benefits, Defined Benefit Plan 0.0 0.0  
Other current liabilities (1.5) (1.6)  
Accrued expenses 0.0 0.0  
Pensions and postretirement health care benefits (noncurrent) $ (23.8) $ (28.6)