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Stockholders' Equity - Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Income before taxes |  | $ 1,014.1 | $ 1,364.8 | $ 1,108.7
Income tax benefit |  | (248.9) | (335.0) | (267.6)
Net income |  | 765.2 | 1,029.8 | $ 841.1
Unfunded Employee Benefit Obligations | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Amortization of prior service costs | [1] | (4.8) | (3.2) |
Amortization of actuarial gains / (losses) | [1] | (3.7) | (3.0) |
Income before taxes |  | (8.5) | (6.2) |
Income tax benefit |  | 2.1 | 1.5 |
Net income |  | $ (6.4) | $ (4.7) |
[1] | These AOCI components are included in the computation of net pension and postretirement benefit costs. See Note 12, Employee Benefit Plans and Other Postretirement Benefits, for additional information.

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