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v3.23.1

Changes in Accumulated Other Comprehensive Loss (Details of Accumulated Other Comprehensive Income Components) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |
Tax impact | $ 28.1 | $ 34.7
Total reclassifications for the period | 2.7 |
Reclassification out of Accumulated Other Comprehensive Income |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |
Total before tax | 3.4 | 4.5
Tax impact | 0.7 | 1.2
Total reclassifications for the period | 2.7 | 3.3
Pension |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |
Prior service costs | 0.0 | 0.0
Net gain (loss) | 3.8 | 4.8
Postretirement |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |
Prior service costs | (0.2) | (0.3)
Net gain (loss) | $ (0.2) | $ 0.0

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