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Other Comprehensive Income (Loss) - Schedule of Tax Effects (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Benefit (expense) for income taxes related to other comprehensive income (loss) | $ (294.7) | $ 196.3 | $ (250.0)
Foreign currency translation gains/losses |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Benefit (expense) for income taxes related to other comprehensive income (loss) | (146.4) | 81.0 | (75.9)
Net unrealized gains/losses on available-for-sale securities |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Benefit (expense) for income taxes related to other comprehensive income (loss) | 1.6 | (3.2) | 12.4
Retirement benefit plans |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Benefit (expense) for income taxes related to other comprehensive income (loss) | (133.2) | 141.5 | (95.6)
Net unrealized gains/losses on cash flow hedges |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Benefit (expense) for income taxes related to other comprehensive income (loss) | $ (16.7) | $ (23.0) | $ (90.9)

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