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Earnings Per Share - Schedule of Computation of Basic and Diluted Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
 [2]
Sep. 30, 2025
 [2]
Sep. 30, 2024
 [2]
Numerator:        
Net income available to common shareholders [1] $ 39.5 $ 8.8 $ 84.3 $ 45.9
Denominator – Weighted-average common shares outstanding (in thousands):        
Basic 16,192 16,087 [3] 16,156 16,062 [3]
Add: dilutive effect of non-vested common shares, restricted stock units and performance shares [4] 420 248 355 229
Diluted 16,612 16,335 [3] 16,511 16,291 [3]
Net income per common share, Basic: $ 2.44 $ 0.54 [3] $ 5.22 $ 2.85 [3]
Net income per common share, Diluted: $ 2.38 $ 0.54 [3] $ 5.1 $ 2.81 [3]
[1] Represents Net income less distributed and undistributed earnings allocated to non-vested restricted stock awards that contain non-forfeitable rights to dividends.
[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] Quantities in the following discussion are denoted in whole shares. During the quarter and nine months ended September 30, 2025 approximately 1 and 196 shares, respectively, were excluded from the weighted-average diluted shares computation as their inclusion would have been anti‑dilutive. For the quarter and nine months ended September 30, 2024, approximately 120 and 700 shares, respectively, were excluded from the weighted-average diluted shares computation as their inclusion would have been anti‑dilutive.