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Other Comprehensive Income (Loss) (Schedule of Tax Effects) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Benefit/(provision) for income taxes allocated to other comprehensive income (loss) items | $ 200.9 | $ 151.0 | $ (30.3)
Foreign Currency Translation Gains (Losses) |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Benefit/(provision) for income taxes allocated to other comprehensive income (loss) items | 128.3 | (18.4) | 51.6
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 | (4.3) | (7.4) | 2.1
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 | 44.8 | 184.1 | (85.3)
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 | $ 32.1 | $ (7.3) | $ 1.3

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