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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income (loss) $ 1,028.8 $ 1,127.2 $ 1,028.8 $ 1,127.2
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance 1,023.7 1,136.0 1,035.7 1,066.6
Other comprehensive income (loss) before reclassifications, net of taxes of $0     8.0  
Amounts reclassified from accumulated other comprehensive income (loss)     (1.2)  
Other comprehensive income (loss), net of tax 7.1 2.6 6.8 85.2
Ending balance 1,028.8 1,127.2 1,028.8 1,127.2
Other comprehensive loss before reclassifications, tax     0.0  
Accumulated Other Comprehensive Income (Loss)        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income (loss) 8.6 4.5 8.6 4.5
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance 1.5 1.9 1.8 (80.7)
Other comprehensive income (loss), net of tax 7.1 2.6 6.8 85.2
Ending balance 8.6 $ 4.5 8.6 $ 4.5
Post-retirement plans        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income (loss) (0.3)   (0.3)  
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance     (0.3)  
Other comprehensive income (loss) before reclassifications, net of taxes of $0     0.0  
Amounts reclassified from accumulated other comprehensive income (loss)     0.0  
Other comprehensive income (loss), net of tax     0.0  
Ending balance (0.3)   (0.3)  
Post-retirement plans | Qualified Plans | Post-retirement plans        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income (loss) (0.3)   (0.3)  
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance     (0.3)  
Ending balance (0.3)   (0.3)  
Interest Rate Swap        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income (loss) 8.9   8.9  
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance     2.1  
Other comprehensive income (loss) before reclassifications, net of taxes of $0     8.0  
Amounts reclassified from accumulated other comprehensive income (loss)     (1.2)  
Other comprehensive income (loss), net of tax     6.8  
Ending balance $ 8.9   $ 8.9