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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, 2023
USD ($)
Defined benefit plans  
Before-Tax Amount  
Accumulated other comprehensive loss, beginning of period $ (304.4)
Accumulated other comprehensive, end of period (299.4)
Income Tax  
Accumulated other comprehensive loss, beginning of period (73.2)
Accumulated other comprehensive loss, end of period (71.9)
After-Tax Amount  
Accumulated other comprehensive loss, beginning of period (231.2)
Amortization of net actuarial losses/prior service cost 3.7
Accumulated other comprehensive loss, end of period (227.5)
Amortization of prior service cost  
Before-Tax Amount  
Amortization of net actuarial losses/prior service cost 0.8
Income Tax  
Amortization of net actuarial losses/prior service cost 0.2
After-Tax Amount  
Amortization of net actuarial losses/prior service cost 0.6
Amortization of net actuarial losses  
Before-Tax Amount  
Amortization of net actuarial losses/prior service cost 4.2
Income Tax  
Amortization of net actuarial losses/prior service cost 1.1
After-Tax Amount  
Amortization of net actuarial losses/prior service cost $ 3.1