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Pension and Postretirement Benefit Plans (Net Periodic Pension Costs Included in Accumulated Other Comprehensive Income (Loss)) (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2022
USD ($)
Defined benefit plans  
Before-Tax Amount  
Accumulated other comprehensive loss, beginning of period $ (302.4)
Accumulated other comprehensive, end of period (320.2)
Income Tax  
Accumulated other comprehensive loss, beginning of period (72.0)
Accumulated other comprehensive loss, end of period (76.3)
After-Tax Amount  
Accumulated other comprehensive loss, beginning of period (230.4)
Amortization of net actuarial losses/prior service cost, after-tax 4.8
Other comprehensive loss before reclassifications (18.3)
Accumulated other comprehensive loss, end of period (243.9)
Amortization of net actuarial losses  
Before-Tax Amount  
Amortization of net actuarial losses/prior service cost, before-tax 6.4
Income Tax  
Amortization of net actuarial losses/prior service cost, income tax 1.7
After-Tax Amount  
Amortization of net actuarial losses/prior service cost, after-tax 4.7
Amortization of prior service cost  
Before-Tax Amount  
Amortization of net actuarial losses/prior service cost, before-tax 0.2
Revision of prior service cost estimate (24.4)
Income Tax  
Amortization of net actuarial losses/prior service cost, income tax 0.1
Revision of prior service cost estimate (6.1)
After-Tax Amount  
Amortization of net actuarial losses/prior service cost, after-tax 0.1
Other comprehensive loss before reclassifications $ (18.3)