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Employee Benefit Plans (Net Funded Status) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Change in plan assets      
Fair value of plan assets at beginning of year $ 711.0    
Fair value of plan assets at end of year   $ 711.0  
Amounts recognized in Consolidated Balance Sheets:      
Pensions and postretirement health care benefits (noncurrent) (253.4) (232.1)  
Pension Benefits      
Change in benefit obligation      
Benefit obligation, beginning of period 917.3 823.1  
Service cost 16.2 15.5 $ 16.6
Interest cost 16.5 20.7 19.9
Plan participants’ contributions 1.3 1.2  
Actuarial losses (gains) 86.8 83.3  
Amendments (0.3) 4.7  
Settlements (0.3) (0.8)  
Benefits paid (44.6) (44.8)  
Foreign currency exchange rate changes 40.8 14.4  
Benefit obligation, end of period 1,033.7 917.3 823.1
Change in plan assets      
Fair value of plan assets at beginning of year 711.0 617.1  
Actual return on plan assets 76.6 91.2  
Employer contributions 32.4 30.6  
Plan participants’ contributions 1.3 1.2  
Benefits paid (44.6) (44.8)  
Settlements (0.3) (0.8)  
Foreign currency exchange rate changes 32.2 16.5  
Fair value of plan assets at end of year 808.6 711.0 617.1
Funded status (225.1) (206.3)  
Unrecognized net actuarial losses 385.1 362.2  
Unrecognized prior service cost 20.1 22.5  
Accumulated other comprehensive loss (405.2) (384.7)  
Net amount recognized (225.1) (206.3)  
Amounts recognized in Consolidated Balance Sheets:      
Assets for Plan Benefits, Defined Benefit Plan 13.2 6.2  
Other current liabilities (6.7) (4.9)  
Accrued expenses (3.2) (3.3)  
Pensions and postretirement health care benefits (noncurrent) (228.4) (204.3)  
Postretirement Benefits      
Change in benefit obligation      
Benefit obligation, beginning of period 29.4 25.3  
Service cost 0.1 0.1 0.1
Interest cost 1.2 1.3 1.4
Plan participants’ contributions 0.0 0.0  
Actuarial losses (gains) (1.1) 4.5  
Amendments 0.0 0.0  
Settlements 0.0 0.0  
Benefits paid (1.5) (1.5)  
Foreign currency exchange rate changes (1.7) (0.3)  
Benefit obligation, end of period 26.4 29.4 25.3
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 1.5 1.5  
Plan participants’ contributions 0.0 0.0  
Benefits paid (1.5) (1.5)  
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 (26.4) (29.4)  
Unrecognized net actuarial losses 2.6 3.9  
Unrecognized prior service cost 2.9 3.0  
Accumulated other comprehensive loss (5.5) (6.9)  
Net amount recognized (26.4) (29.4)  
Amounts recognized in Consolidated Balance Sheets:      
Assets for Plan Benefits, Defined Benefit Plan 0.0 0.0  
Other current liabilities (1.4) (1.6)  
Accrued expenses 0.0 0.0  
Pensions and postretirement health care benefits (noncurrent) $ (25.0) $ (27.8)