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Pension and Postretirement Benefit Plans (Net Periodic Pension Costs Included in Accumulated Other Comprehensive Income (Loss)) (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2023
USD ($)
Defined benefit plans  
Before-Tax Amount  
Accumulated other comprehensive loss, beginning of period $ (304.4)
Accumulated other comprehensive, end of period (302.0)
Income Tax  
Accumulated other comprehensive loss, beginning of period (73.2)
Accumulated other comprehensive loss, end of period (72.6)
After-Tax Amount  
Accumulated other comprehensive loss, beginning of period (231.2)
Amortization of net actuarial losses/prior service cost 1.8
Accumulated other comprehensive loss, end of period (229.4)
Amortization of prior service cost  
Before-Tax Amount  
Amortization of net actuarial losses/prior service cost 0.4
Income Tax  
Amortization of net actuarial losses/prior service cost 0.1
After-Tax Amount  
Amortization of net actuarial losses/prior service cost 0.3
Amortization of net actuarial losses  
Before-Tax Amount  
Amortization of net actuarial losses/prior service cost 2.0
Income Tax  
Amortization of net actuarial losses/prior service cost 0.5
After-Tax Amount  
Amortization of net actuarial losses/prior service cost $ 1.5