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Accumulated Other Comprehensive Income - Schedule of Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance $ 756.8 $ 743.1 [1],[2] $ 714.7 [3] $ 652.2 [3] $ 743.1 [1],[2] $ 652.2 [3]
Other comprehensive income (loss), net of tax 4.1 2.6 3.2 [4] (2.1) [3] 6.7 1.1 [4]
Ending balance 776.0 756.8 727.6 [3] 714.7 [3] 776.0 727.6 [3]
Defined Benefit Plans:            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance 19.2 19.1 10.5 11.0 19.1 11.0
Less: income tax benefit (expense) [5] (0.1)   (0.1)   (0.2)  
Net (gain) loss reclassified from AOCI to Net income 0.4   0.5   0.6  
Other comprehensive income (loss), net of tax 0.4   (0.1)   0.5 (0.6)
Ending balance 19.6 19.2 10.4 10.5 19.6 10.4
Defined Benefit Plans: Net Actuarial Gain (Loss)            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Unrealized gain on cash flow hedges     1.4   (0.1) 1.4
Less: income tax expense     (0.3)     (0.3)
Net unrealized gain (loss) on available for sale securities, cash flow hedges and fair value hedges     1.1   (0.1) 1.1
Reclassification from AOCI [6] (0.5)   (0.2)   (1.1) (0.5)
Defined Benefit Plans: Net Prior Service Cost            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Unrealized gain on cash flow hedges     (2.2)     (2.2)
Less: income tax expense     0.5     0.5
Net unrealized gain (loss) on available for sale securities, cash flow hedges and fair value hedges     (1.7)     (1.7)
Reclassification from AOCI [6] 1.0   0.8   1.9 0.5
Cash Flow Hedges:            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance 3.9 1.4 0.5 2.1 1.4 2.1
Unrealized gain on cash flow hedges 7.5   6.1   16.2 1.9
Less: income tax expense (1.8)   (1.4)   (3.8) (0.4)
Net unrealized gain (loss) on available for sale securities, cash flow hedges and fair value hedges 5.7   4.7   12.4 1.5
Reclassification from AOCI (2.5)   (2.0)   (8.0) 0.1
Reclassification due to forecasted transactions probable of not occurring     0.2     0.2
Less: income tax benefit (expense) [5] 0.5   0.4   1.8 (0.1)
Net (gain) loss reclassified from AOCI to Net income (2.0)   (1.4)   (6.2) 0.2
Other comprehensive income (loss), net of tax 3.7   3.3   6.2 1.7
Ending balance 7.6 [7] 3.9 3.8 [7] 0.5 7.6 [7] 3.8 [7]
Accumulated Other Comprehensive Income (Loss)            
AOCI Attributable to Parent, Net of Tax [Roll Forward]            
Beginning balance 23.1 20.5 [1] 11.0 [3] 13.1 20.5 [1] 13.1
Other comprehensive income (loss), net of tax 4.1 2.6 3.2 (2.1)    
Ending balance $ 27.2 $ 23.1 $ 14.2 [3] $ 11.0 [3] $ 27.2 $ 14.2 [3]
[1] Adjusted to reflect the retrospective change in inventory valuation methodology from LIFO to WAC. See Note 14 for further discussion.
[2] Adjusted to reflect the retrospective change in inventory valuation methodology from LIFO to WAC. See Note 14 for further discussion.
[3] Adjusted to reflect the retrospective change in inventory valuation methodology from LIFO to WAC. See Note 14 for further discussion.
[4] Adjusted to reflect the retrospective change in inventory valuation methodology from LIFO to WAC. See Note 14 for further discussion.
[5] Income tax amounts reclassified out of AOCI were included as a component of Income tax provision.
[6] Amounts amortized out of AOCI related to pension and other postretirement and postemployment benefits were included within Net periodic postretirement and postemployment benefit cost (see Note 3).
[7] As of June 30, 2025, we estimate a net mark-to-market gain before tax of $9.1 million in AOCI will be reclassified into Net income upon settlement within the next 12 months.