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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, 2021
USD ($)
Defined benefit plans  
Before-Tax Amount  
Accumulated other comprehensive loss, beginning of period $ (412.5)
Accumulated other comprehensive, end of period (369.8)
Income Tax  
Accumulated other comprehensive loss, beginning of period (99.2)
Accumulated other comprehensive loss, end of period (88.2)
After-Tax Amount  
Accumulated other comprehensive loss, beginning of period (313.3)
Net losses reclassified from accumulated other comprehensive loss into income 8.5
Other comprehensive income for plan amendment 23.2
Accumulated other comprehensive loss, end of period (281.6)
Amortization of net actuarial losses  
Before-Tax Amount  
Net gains reclassified from accumulated other comprehensive loss into income 10.8
Income Tax  
Amortization of prior service cost and net actual loss 2.7
After-Tax Amount  
Net losses reclassified from accumulated other comprehensive loss into income 8.1
Amortization of prior service cost  
Before-Tax Amount  
Net gains reclassified from accumulated other comprehensive loss into income 0.7
Income Tax  
Amortization of prior service cost and net actual loss 0.3
After-Tax Amount  
Net losses reclassified from accumulated other comprehensive loss into income 0.4
Plan amendment  
Before-Tax Amount  
Other comprehensive income for plan amendment 31.2
Income Tax  
Other Comprehensive Income for plan amendment 8.0
After-Tax Amount  
Other comprehensive income for plan amendment 23.2
Remeasurement gain driven by higher discount rate 10.5
Remeasurement gain due to elimination of life-time annuity feature 12.2
Remeasurement gain due to freezing benefits 9.7
Curtailment gain $ 1.2