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Pension and Postretirement Benefit Plans (Net Periodic Pension Costs Included in Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
After-Tax Amount    
Net losses reclassified from accumulated other comprehensive loss into income $ 7.6 $ 3.4
Defined Benefit Pension Plans    
Before-Tax Amount    
Accumulated other comprehensive loss, beginning of period (412.5)  
Net gains reclassified from accumulated other comprehensive loss into income 4.5 4.0
Accumulated other comprehensive, end of period (376.8)  
Income Tax    
Accumulated other comprehensive loss, beginning of period (99.2)  
Amortization of prior service cost and net actual loss 0.6 0.5
Accumulated other comprehensive loss, end of period (98.6)  
After-Tax Amount    
Accumulated other comprehensive loss, beginning of period (313.3)  
Net losses reclassified from accumulated other comprehensive loss into income 3.9 3.5
Other comprehensive income for plan amendment 31.2  
Accumulated other comprehensive loss, end of period (278.2)  
Amortization of net actuarial losses    
Before-Tax Amount    
Net gains reclassified from accumulated other comprehensive loss into income 4.0 3.5
Income Tax    
Amortization of prior service cost and net actual loss 0.6  
After-Tax Amount    
Net losses reclassified from accumulated other comprehensive loss into income 3.4  
Amortization of prior service cost    
Before-Tax Amount    
Net gains reclassified from accumulated other comprehensive loss into income 0.5 $ 0.5
Income Tax    
Amortization of prior service cost and net actual loss 0.0  
After-Tax Amount    
Net losses reclassified from accumulated other comprehensive loss into income 0.5  
Remeasurement    
Before-Tax Amount    
Other comprehensive income for plan amendment 31.2  
Income Tax    
Other Comprehensive Income for plan amendment 0.0  
After-Tax Amount    
Other comprehensive income for plan amendment 31.2  
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