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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Benefit/(provision) for income taxes allocated to other comprehensive income (loss) items | $ (250.0) | $ (695.3) | $ 200.9
Foreign Currency Translation Gains (Losses) |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Benefit/(provision) for income taxes allocated to other comprehensive income (loss) items | (75.9) | (136.2) | 128.3
Unrealized Net Gains (Losses) on Securities |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Benefit/(provision) for income taxes allocated to other comprehensive income (loss) items | 12.4 | 4.7 | (4.3)
Defined Benefit Pension and Retiree Health Benefit Plans |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Benefit/(provision) for income taxes allocated to other comprehensive income (loss) items | (95.6) | (532.0) | 44.8
Effective Portion of Cash Flow Hedges |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Benefit/(provision) for income taxes allocated to other comprehensive income (loss) items | $ (90.9) | $ (31.8) | $ 32.1

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