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Other Comprehensive Income (Loss) (Schedule of Tax Effects) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Benefit/(provision) for income taxes allocated to other comprehensive income (loss) items | $ (695.3) | $ 200.9 | $ 151.0
Foreign Currency Translation Gains (Losses) |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Benefit/(provision) for income taxes allocated to other comprehensive income (loss) items | (136.2) | 128.3 | (18.4)
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 | 4.7 | (4.3) | (7.4)
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 | (532.0) | 44.8 | 184.1
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 | $ (31.8) | $ 32.1 | $ (7.3)

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