Annual report pursuant to Section 13 and 15(d)

Postretirement Benefits Benefit Obligations, Plan Assets and Funded Status (Details)

v3.20.4
Postretirement Benefits Benefit Obligations, Plan Assets and Funded Status (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Change in Plan Assets [Roll Forward]      
Funded Percentage   38.00%  
Pension Plans [Member]      
Change in Benefit Obligations [Roll Forward]      
Benefit Obligation at Previous December 31 $ 28.1 $ 652.8  
Interest Cost 0.7 6.0 $ 22.6
Actuarial (Gains) Losses 2.1 77.3  
Benefit Payments (3.4) (34.1)  
Settlement Payments 0.0 (673.9)  
Benefit Obligation at December 31 27.5 28.1 652.8
Change in Plan Assets [Roll Forward]      
Fair Value of Plan Assets at Previous December 31 10.6 642.0  
Actual Return on Plan Assets 0.0 70.8  
Employer Contributions 3.4 7.9  
Benefit Payments (3.4) (34.1)  
Settlement Payments 0.0 (673.9)  
Defined Benefit Plan, Plan Assets, Adjustments (10.6) [1] (2.1)  
Fair Value of Plan Assets at December 31 0.0 10.6 642.0
Funded Status at December 31 (27.5) (17.5)  
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]      
Asset, Defined Benefit Plan, Prepaid Expenses and Other 0.0 0.0  
Assets, Defined Benefit Plan, Accounts and Notes Receivable 0.0 10.6  
Assets for Plan Benefits, Defined Benefit Plan 0.0 10.6  
Liability, Defined Benefit Plan, Current 3.0 3.5  
Liability, Defined Benefit Plan, Noncurrent 24.5 24.6  
Liability, Defined Benefit Plan 27.5 28.1  
Other Postretirement Benefit Plans [Member]      
Change in Benefit Obligations [Roll Forward]      
Benefit Obligation at Previous December 31 33.0 34.3  
Interest Cost 0.8 1.3 1.1
Actuarial (Gains) Losses 1.8 0.2  
Benefit Payments (2.4) (2.8)  
Settlement Payments 0.0 0.0  
Benefit Obligation at December 31 33.2 33.0 34.3
Change in Plan Assets [Roll Forward]      
Fair Value of Plan Assets at Previous December 31 0.0 0.0  
Actual Return on Plan Assets 0.0 0.0  
Employer Contributions 2.4 2.8  
Benefit Payments (2.4) (2.8)  
Settlement Payments 0.0 0.0  
Defined Benefit Plan, Plan Assets, Adjustments 0.0 0.0  
Fair Value of Plan Assets at December 31 0.0 0.0 $ 0.0
Funded Status at December 31 (33.2) (33.0)  
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]      
Asset, Defined Benefit Plan, Prepaid Expenses and Other 0.0 0.0  
Assets, Defined Benefit Plan, Accounts and Notes Receivable 0.0 0.0  
Assets for Plan Benefits, Defined Benefit Plan 0.0 0.0  
Liability, Defined Benefit Plan, Current 3.1 3.6  
Liability, Defined Benefit Plan, Noncurrent 30.1 29.4  
Liability, Defined Benefit Plan 33.2 33.0  
Nonqualified Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation 27.5 28.1  
Foreign Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation $ 17.1 $ 17.5  
[1] (A) 2020 adjustment represents the overfunded position of the Company's salaried bargaining plans refunded during the year.