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Consolidated Statements of Stockholder's Equity (Parenthetical) - USD ($) $ in Millions | 3 Months Ended
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Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020
Statement of Stockholders' Equity [Abstract] |  |  |  |  |  |
Pension and OPEB, Tax | $ (0.3) | $ 0.7 | $ 0.7 | $ 0.6 | $ 0.6 | $ 0.6

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