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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance, beginning of period     $ 981.3  
Balance, end of period $ 1,042.3 $ 1,100.8 1,042.3 $ 1,100.8
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax 11.0 2.2 33.0 6.6
Foreign Currency Translation Adjustment        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance, beginning of period     1.8  
Reclassification from other comprehensive income to earnings     0.0  
Current period change     (1.2)  
Balance, end of period 0.6   0.6  
Prior Service Credit Associated with Postretirement Plans        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance, beginning of period     204.0  
Reclassification from other comprehensive income to earnings (33.0)      
Current period change     0.0  
Balance, end of period 171.0   171.0  
Total Accumulated Other Comprehensive Income        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance, beginning of period 183.4 26.5 205.8 31.6
Reclassification from other comprehensive income to earnings     (33.0)  
Current period change     (1.2)  
Balance, end of period $ 171.6 $ 201.3 $ 171.6 $ 201.3