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Pension and Postretirement Benefit Plans (Net Periodic Pension Costs Included in Accumulated Other Comprehensive Income (Loss)) (Details)
$ in Millions
 6 Months Ended
Jun. 30, 2022
USD ($)
Defined benefit plans  
Before-Tax Amount  
Accumulated other comprehensive loss, beginning of period $ (302.4)
Accumulated other comprehensive, end of period (297.8)
Income Tax  
Accumulated other comprehensive loss, beginning of period (72.0)
Accumulated other comprehensive loss, end of period (70.8)
After-Tax Amount  
Accumulated other comprehensive loss, beginning of period (230.4)
Amortization of net actuarial losses/prior service cost, after-tax 3.4
Accumulated other comprehensive loss, end of period (227.0)
Amortization of net actuarial losses  
Before-Tax Amount  
Amortization of net actuarial losses/prior service cost, before-tax 4.4
Income Tax  
Amortization of net actuarial losses/prior service cost, income tax 1.1
After-Tax Amount  
Amortization of net actuarial losses/prior service cost, after-tax 3.3
Amortization of prior service cost  
Before-Tax Amount  
Amortization of net actuarial losses/prior service cost, before-tax 0.2
Income Tax  
Amortization of net actuarial losses/prior service cost, income tax 0.1
After-Tax Amount  
Amortization of net actuarial losses/prior service cost, after-tax $ 0.1