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Employee Benefit Plans - Schedule of the Status of Funded Defined Benefit Pension Plan and Unfunded Accumulated Post-retirement Benefit Plans (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Pension Benefits      
Change in Benefit Obligation      
Benefit obligation at beginning of year $ 204.4 $ 189.6  
Service cost 0.8 2.3 $ 1.8
Interest cost 6.5 8.0 7.4
Plan participants’ contributions 0.0 0.0  
Actuarial (gain) loss 21.1 19.0  
Benefits paid (14.1) (14.5)  
Settlement 0.0 0.0  
Benefit obligation at end of year 218.7 204.4 189.6
Change in Plan Assets      
Fair value of plan assets at beginning of year 190.5 173.6  
Actual return on plan assets 24.2 31.4  
Employer contributions 0.0 0.0 0.0
Participant contributions 0.0 0.0  
Benefits paid (14.1) (14.5)  
Settlement 0.0 0.0  
Fair value of plan assets at end of year 200.6 190.5 173.6
Funded Status (Recognized Liability) (18.1) (13.9)  
Other Post-retirement Benefits      
Change in Benefit Obligation      
Benefit obligation at beginning of year 10.1 10.6  
Service cost 0.1 0.1 0.1
Interest cost 0.3 0.4 0.4
Plan participants’ contributions 0.8 0.8  
Actuarial (gain) loss 3.7 (0.3)  
Benefits paid (1.5) (1.5)  
Settlement 0.0 0.0  
Benefit obligation at end of year 13.5 10.1 10.6
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 0.7 0.8  
Participant contributions 0.8 0.7  
Benefits paid (1.5) (1.5)  
Settlement 0.0 0.0  
Fair value of plan assets at end of year 0.0 0.0 0.0
Funded Status (Recognized Liability) (13.5) (10.1)  
Other Post-retirement Benefits | Non-qualified Plan Benefits      
Change in Benefit Obligation      
Benefit obligation at beginning of year 2.8 2.7  
Service cost 0.0 0.1 0.1
Interest cost 0.1 0.1 0.1
Plan participants’ contributions 0.0 0.0  
Actuarial (gain) loss 0.2 0.2  
Benefits paid 0.0 (0.3)  
Settlement 0.0 0.0  
Benefit obligation at end of year 3.1 2.8 2.7
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 0.0 0.3  
Participant contributions 0.0 0.0  
Benefits paid 0.0 (0.3)  
Settlement 0.0 0.0  
Fair value of plan assets at end of year 0.0 0.0 $ 0.0
Funded Status (Recognized Liability) $ (3.1) $ (2.8)