v3.26.1
Stockholder's Equity - Changes in Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balances $ 1,651.7 $ 1,447.3 $ 1,598.5 $ 1,390.2
Other comprehensive income (loss) before reclassifications     1.1 (0.3)
Amounts reclassified from accumulated other comprehensive loss     (0.1) (0.8)
Total Other Comprehensive Income (Loss), net of tax (0.2) (0.5) 1.0 (1.1)
Ending balances 1,673.4 1,499.1 1,673.4 1,499.1
Total        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balances (1.5) (2.3) (2.7) (1.7)
Total Other Comprehensive Income (Loss), net of tax (0.2) (0.5) 1.0 (1.1)
Ending balances (1.7) (2.8) (1.7) (2.8)
Defined Benefit Pension and Postretirement Plan Items        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balances     (1.7) (2.1)
Other comprehensive income (loss) before reclassifications     0.0 0.0
Amounts reclassified from accumulated other comprehensive loss     0.0 0.0
Total Other Comprehensive Income (Loss), net of tax     0.0 0.0
Ending balances (1.7) (2.1) (1.7) (2.1)
Commodity Contract Cash Flow Hedges        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balances     (0.5) 0.4
Other comprehensive income (loss) before reclassifications (0.5) (0.3) 0.6 0.4
Amounts reclassified from accumulated other comprehensive loss (0.2) (0.1) (0.1) (0.6)
Total Other Comprehensive Income (Loss), net of tax     0.5 (0.2)
Ending balances 0.0 0.2 0.0 0.2
Interest Rate Swap Cash Flow Hedges        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balances     (0.5) 0.0
Other comprehensive income (loss) before reclassifications 0.5 0.0 0.5 (0.7)
Amounts reclassified from accumulated other comprehensive loss 0.0 (0.1) 0.0 (0.2)
Total Other Comprehensive Income (Loss), net of tax     0.5 (0.9)
Ending balances $ 0.0 $ (0.9) $ 0.0 $ (0.9)