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Employee Benefit Plans (Net Funded Status) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Change in plan assets      
Fair value of plan assets at beginning of year $ 617.1    
Fair value of plan assets at end of year   $ 617.1  
Unrecognized net actuarial losses (gains) 393.2 379.8 $ 380.6
Amounts recognized in Consolidated Balance Sheets:      
Pensions and postretirement health care benefits (noncurrent) (232.1) (223.2)  
Pension Benefits      
Change in benefit obligation      
Benefit obligation, beginning of period 823.1 916.7  
Service cost 15.5 16.6 17.1
Interest cost 20.7 19.9 20.6
Plan participants’ contributions 1.2 1.2  
Actuarial losses (gains) 83.3 (55.2)  
Amendments 4.7 8.5  
Settlements (0.8) (1.5)  
Benefits paid (44.8) (45.9)  
Defined Benefit Plan, Special Termination Benefits and Other 0.0 1.9  
Foreign currency exchange rate changes 14.4 (39.1)  
Benefit obligation, end of period 917.3 823.1 916.7
Change in plan assets      
Fair value of plan assets at beginning of year 617.1 691.8  
Actual return on plan assets 91.2 (32.4)  
Employer contributions 30.6 36.8  
Plan participants’ contributions 1.2 1.2  
Benefits paid (44.8) (45.9)  
Settlements (0.8) (1.5)  
Foreign currency exchange rate changes 16.5 (32.9)  
Fair value of plan assets at end of year 711.0 617.1 691.8
Funded status (206.3) (206.0)  
Unrecognized net actuarial losses (gains) 362.2 356.7  
Unrecognized prior service cost 22.5 19.5  
Accumulated other comprehensive loss (384.7) (376.2)  
Net amount recognized (206.3) (206.0)  
Amounts recognized in Consolidated Balance Sheets:      
Assets for Plan Benefits, Defined Benefit Plan 6.2 0.1  
Other current liabilities (4.9) (3.8)  
Accrued expenses (3.3) (2.9)  
Pensions and postretirement health care benefits (noncurrent) (204.3) (199.4)  
Postretirement Benefits      
Change in benefit obligation      
Benefit obligation, beginning of period 25.3 30.2  
Service cost 0.1 0.1 0.1
Interest cost 1.3 1.4 1.4
Plan participants’ contributions 0.0 0.0  
Actuarial losses (gains) 4.5 (4.2)  
Amendments 0.0 0.0  
Settlements 0.0 0.0  
Benefits paid (1.5) (1.4)  
Defined Benefit Plan, Special Termination Benefits and Other 0.0 0.0  
Foreign currency exchange rate changes (0.3) (0.8)  
Benefit obligation, end of period 29.4 25.3 30.2
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 1.5 1.4  
Plan participants’ contributions 0.0 0.0  
Benefits paid (1.5) (1.4)  
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 (29.4) (25.3)  
Unrecognized net actuarial losses (gains) 3.9 (0.6)  
Unrecognized prior service cost 3.0 3.1  
Accumulated other comprehensive loss (6.9) (2.5)  
Net amount recognized (29.4) (25.3)  
Amounts recognized in Consolidated Balance Sheets:      
Assets for Plan Benefits, Defined Benefit Plan 0.0 0.0  
Other current liabilities (1.6) (1.5)  
Accrued expenses 0.0 0.0  
Pensions and postretirement health care benefits (noncurrent) $ (27.8) $ (23.8)