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Shareholders' Equity (Reclassification out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |
Interest expense |  | $ (7.8) | $ (8.6) |  | $ (15.1) | $ (17.1) |
Tax impact |  | (30.2) | (27.5) |  | (51.8) | (49.1) |
Derivative (Loss) Gain [Member] |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |
Total loss (income), net of tax | [1] | 0.4 | 0.0 | [2] | 0.7 | (0.3) | [2]
Pension And Postretirement Adjustments [Member] |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |
Total loss (income), net of tax | [1] | 0.7 | 0.7 |  | 1.3 | 1.3 |
Reclassification From Accumulated Other Comprehensive Loss [Member] | Derivative (Loss) Gain [Member] |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |
Tax impact |  | (0.1) | 0.0 |  | (0.2) | 0.1 |
Total loss (income), net of tax |  | 0.4 | 0.0 |  | 0.7 | (0.3) |
Reclassification From Accumulated Other Comprehensive Loss [Member] | Derivative (Loss) Gain [Member] | Interest Rate Swap Contracts, Before Tax [Member] |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |
Interest expense |  | 0.5 | 0.0 |  | 0.9 | (0.4) |
Reclassification From Accumulated Other Comprehensive Loss [Member] | Amortization of Prior Service Credit [Member] |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |
Amortization of net actuarial loss |  | 0.0 | (0.1) |  | 0.0 | (0.1) |
Reclassification From Accumulated Other Comprehensive Loss [Member] | Amortization of Net Actuarial Loss [Member] |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |
Amortization of net actuarial loss |  | 1.0 | 1.0 |  | 1.8 | 1.9 |
Reclassification From Accumulated Other Comprehensive Loss [Member] | Pension And Postretirement Adjustments [Member] |  |  |  |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |
Tax impact |  | (0.3) | (0.2) |  | (0.5) | (0.5) |
Total loss, before tax |  | 1.0 | 0.9 |  | 1.8 | 1.8 |
Total loss, net of tax |  | 0.7 | 0.7 |  | 1.3 | 1.3 |
Total reclassifications for the period |  | $ 1.1 | $ 0.7 |  | $ 2.0 | $ 1.0 |
[1] | Amounts are net of tax.
[2] | Amounts include our 50% share of AOCL components from our WAVE joint venture.

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