Annual report pursuant to Section 13 and 15(d)

Postretirement Benefits Schedule of Net Periodic Benefit Costs (Details)

v3.22.0.1
Postretirement Benefits Schedule of Net Periodic Benefit Costs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]      
Settlement Loss $ 0.0 $ (1.1) $ 292.8
Pension Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Interest Cost 0.4 0.7 6.0
Expected Return on Plan Assets 0.0 0.0 (7.4)
Amortization of Prior Service Credits 0.0 0.0 0.0
Amortization of Net Actuarial Losses 0.8 0.6 5.8
Settlement Loss 0.0 (1.1) 292.8
Net Pension and Other Benefit Costs 1.2 0.2 297.2
Other Postretirement Benefit Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Interest Cost 0.0 0.8 1.3
Expected Return on Plan Assets 0.0 0.0 0.0
Amortization of Prior Service Credits 0.0 (0.7) (0.7)
Amortization of Net Actuarial Losses 0.0 0.0 0.0
Settlement Loss 0.0 0.0 0.0
Net Pension and Other Benefit Costs $ 0.0 $ 0.1 $ 0.6