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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) (Parenthetical) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Statement of Comprehensive Income [Abstract] |  |  |  |
Postretirement adjustments tax | $ 1.7 | $ (10.8) | $ 5.5 | $ (15.7)

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