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CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Unrealized net gain on cash flow derivative instruments |  |  |
Income tax benefit (provision) on other comprehensive income (loss) | $ 0.7 | $ 1.4 | $ (1.4)
Change in pension liability |  |  |
Income tax benefit (provision) on other comprehensive income (loss) | $ 0.5 | $ 0.5 | $ (179.0)
Treasury Stock |  |  |
Shares surrendered as proceeds and to pay taxes (in shares) | 36,300 | 61,605 | 47,309

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