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v3.21.2

Stockholders' Equity - Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Income before taxes |  | $ 333.9 | $ 185.7 | $ 828.3 | $ 467.3
Income tax benefit |  | (83.2) | (46.6) | (203.7) | (129.9)
Net income |  | 250.7 | 139.1 | 624.6 | 337.4
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] | (0.8) | (1.0) | (2.5) | (3.0)
Amortization of actuarial losses | [1] | (2.5) | (2.6) | (7.5) | (7.8)
Income before taxes |  | (3.3) | (3.6) | (10.0) | (10.8)
Income tax benefit |  | 0.8 | 0.9 | 2.5 | 2.7
Net income |  | $ (2.5) | $ (2.7) | $ (7.5) | $ (8.1)
[1] | These AOCI components are included in the computation of net pension and postretirement benefit costs. See Note 13, Employee Benefit Plans and Other Postretirement Benefits, for additional information.

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