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Shareholders' Equity (Schedule of Accumulated Other Comprehensive Income (Loss) Activity (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |  |  |
Beginning Balance |  | $ 837.8 | $ 669.0 |  | $ 757.1 |  | $ 591.8 |
Ending Balance |  | 889.2 | 717.0 |  | 889.2 |  | 717.0 |
Foreign Currency Translation Adjustments [Member] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |  |  |
Beginning Balance | [1] | (0.4) | (0.2) |  | (2.2) |  | 1.0 |
Other comprehensive income (loss) before reclassifications, net of tax (expense) benefit | [1] | (0.9) | 0.3 |  | 0.9 |  | (0.9) |
Amounts reclassified from accumulated other comprehensive (loss) | [1] | 0.0 | 0.0 |  | 0.0 |  | 0.0 |
Net current period other comprehensive income (loss) | [1] | (0.9) | 0.3 |  | 0.9 |  | (0.9) |
Ending Balance | [1] | (1.3) | 0.1 |  | (1.3) |  | 0.1 |
Derivative Gain (Loss) [Member] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |  |  |
Beginning Balance | [1],[2] | (2.9) | 1.2 |  | (1.1) |  | 0.5 |
Other comprehensive income (loss) before reclassifications, net of tax (expense) benefit | [1],[2] | 0.1 | (4.7) |  | (1.4) |  | (1.4) |
Amounts reclassified from accumulated other comprehensive (loss) | [1],[2] | (0.1) | (1.0) |  | (0.4) |  | (3.6) |
Net current period other comprehensive income (loss) | [1],[2] | 0.0 | (5.7) |  | (1.8) |  | (5.0) |
Ending Balance | [1],[2] | (2.9) | (4.5) |  | (2.9) |  | (4.5) |
Pension And Postretirement Adjustments [Member] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |  |  |
Beginning Balance | [1] | (105.6) | (107.5) | [2] | (106.9) | [2] | (106.2) | [2]
Other comprehensive income (loss) before reclassifications, net of tax (expense) benefit | [1] | 0.0 | (0.4) | [2] | 0.0 | [2] | (0.4) | [2]
Amounts reclassified from accumulated other comprehensive (loss) | [1] | 0.6 | (0.6) | [2] | 1.9 | [2] | (1.9) | [2]
Net current period other comprehensive income (loss) | [1] | 0.6 | (1.0) | [2] | 1.9 | [2] | (2.3) | [2]
Ending Balance | [1],[2] | (105.0) | (108.5) |  | (105.0) |  | (108.5) |
Accumulated Other Comprehensive (Loss) [Member] |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |  |  |  |  |
Beginning Balance | [1],[2] | (108.9) | (106.5) |  | (110.2) |  | (104.7) |
Other comprehensive income (loss) before reclassifications, net of tax (expense) benefit | [1],[2] | (0.8) | (4.8) |  | (0.5) |  | (2.7) |
Amounts reclassified from accumulated other comprehensive (loss) | [1],[2] | 0.5 | (1.6) |  | 1.5 |  | (5.5) |
Net current period other comprehensive income (loss) | [1],[2] | (0.3) | (6.4) |  | 1.0 |  | (8.2) |
Ending Balance | [1],[2] | $ (109.2) | $ (112.9) |  | $ (109.2) |  | $ (112.9) |
[1] | Amounts are net of tax.
[2] | Amounts include our 50% share of AOCL components from our WAVE joint venture.

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