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Operations and Summary of Significant Accounting Policies (Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), net of reclassification adjustments | $ 95.0 | $ (31.3) | $ 39.5
AOCI Attributable To Parent |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), before tax amount | 92.0 | (33.4) | 67.5
Other comprehensive income (loss), income taxes | 3.0 | 1.2 | (27.6)
Other comprehensive income (loss), net of reclassification adjustments | 95.0 | (32.2) | 39.9
Defined benefit pension plans |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), before tax amount | (10.0) | (2.0) | 110.1
Other comprehensive income (loss), income taxes | 2.6 | 1.2 | (27.2)
Other comprehensive income (loss), net of reclassification adjustments | (7.4) | (0.8) | 82.9
Deferred gains and losses on derivatives |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), before tax amount | (0.3) | (0.5) | 2.5
Other comprehensive income (loss), income taxes | 0.4 | 0.0 | (0.4)
Other comprehensive income (loss), net of reclassification adjustments | 0.1 | (0.5) | 2.1
Foreign currency translation adjustments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), before tax amount | 102.3 | (30.9) | (45.1)
Other comprehensive income (loss), income taxes | 0.0 | 0.0 | 0.0
Other comprehensive income (loss), net of reclassification adjustments | 102.3 | (30.9) | (45.1)
AOCI Attributable to Noncontrolling Interest |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), net of reclassification adjustments | 0.0 | 0.9 | (0.4)
Defined benefit pension plans |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), net of reclassification adjustments | 0.0 | 0.0 | 0.0
Deferred gains and losses on derivatives |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), net of reclassification adjustments | 0.0 | 0.0 | 0.0
Foreign currency translation adjustments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income (loss), net of reclassification adjustments | $ 0.0 | $ 0.9 | $ (0.4)

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