Annual report pursuant to Section 13 and 15(d)

Pension And Other Postretirement Benefit Programs - Summary of Balance Sheet Impact of Postretirement Benefit Plans, Related Benefit Obligations, Assets, Funded Status Rate Assumptions (Details)

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Pension And Other Postretirement Benefit Programs - Summary of Balance Sheet Impact of Postretirement Benefit Plans, Related Benefit Obligations, Assets, Funded Status Rate Assumptions (Details) - Postretirement Benefits Plan - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Benefit obligations as of beginning of period $ 62.2 $ 76.4  
Service cost 0.2 0.4 $ 0.4
Interest cost 2.5 2.6 3.2
Plan participants' contributions 2.2 1.6  
Effect of curtailment 0.0 (0.2)  
Actuarial loss/(gain) (10.0) 9.0  
Benefits paid 9.2 9.6  
Benefit obligation as of end of period 65.3 62.2 76.4
Fair value of plan assets as of beginning of period 0.0 0.0  
Employer contribution 7.0 8.0  
Plan participants' contribution 2.2 1.6  
Benefits paid 9.2 9.6  
Fair value of plan assets as of end of period 0.0 0.0 $ 0.0
Funded status of the plans $ (65.3) $ (62.2)