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Other Comprehensive Income (Loss) (Schedule of Component of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | $ 2,699.1 |  |  |
Other comprehensive income (loss) before reclassifications | (256.2) | $ (997.6) | $ (106.9) |
Net amount reclassified from accumulated other comprehensive loss | 283.4 | 214.2 | 190.5 |
Net other comprehensive income (loss) | 27.2 | (783.4) | 83.6 |
Ending balance | 5,825.2 | 2,699.1 |  |
Accumulated other comprehensive income (loss) | (6,496.4) | (6,523.6) |  |
Accumulated Other Comprehensive Loss |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (6,523.6) | (5,740.2) | (5,694.9) |
Reclassification due to adoption of new accounting standard |  |  | (128.9) |
Ending balance | (6,496.4) | (6,523.6) | (5,740.2) |
Accumulated Other Comprehensive Loss |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (6,523.6) | (5,729.2) | (5,718.6) |
Reclassification due to adoption of new accounting standard |  |  | 105.2 |
Ending balance | (6,496.4) | (6,523.6) | (5,729.2) |
AOCI Attributable to Noncontrolling Interest |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Accumulated other comprehensive income (loss) |  |  | (11.0) | $ 23.7
Continuing Operations |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Net other comprehensive income (loss) | 27.2 | (840.2) | 69.3 |
Continuing Operations | Foreign Currency Translation Gains (Losses) |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (1,678.0) | (1,569.7) | (1,191.7) |
Other comprehensive income (loss) before reclassifications | 250.5 | (46.2) | (378.0) |
Net amount reclassified from accumulated other comprehensive loss | 0.0 | (62.1) | 0.0 |
Net other comprehensive income (loss) | 250.5 | (108.3) | (378.0) |
Ending balance | (1,427.5) | (1,678.0) | (1,569.7) |
Continuing Operations | Unrealized Net Gains (Losses) on Securities |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 4.9 | (22.1) | 113.5 |
Reclassification due to adoption of new accounting standard |  |  | (128.9) |
Other comprehensive income (loss) before reclassifications | 6.8 | 28.9 | 24.5 |
Net amount reclassified from accumulated other comprehensive loss | 3.1 | (1.9) | (31.2) |
Net other comprehensive income (loss) | 9.9 | 27.0 | (6.7) |
Ending balance | 14.8 | 4.9 | (22.1) |
Continuing Operations | Defined Benefit Pension and Retiree Health Benefit Plans |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (4,638.6) | (3,852.7) | (4,311.3) |
Other comprehensive income (loss) before reclassifications | (379.7) | (967.6) | 250.7 |
Net amount reclassified from accumulated other comprehensive loss | 267.3 | 181.7 | 207.9 |
Net other comprehensive income (loss) | (112.4) | (785.9) | 458.6 |
Ending balance | (4,751.0) | (4,638.6) | (3,852.7) |
Continuing Operations | Effective Portion of Cash Flow Hedges |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning balance |  | (238.9) | (234.3) |
Other comprehensive income (loss) before reclassifications |  | 14.5 | (16.3) |
Net amount reclassified from accumulated other comprehensive loss |  | 12.5 | 11.7 |
Net other comprehensive income (loss) |  | 27.0 | (4.6) |
Ending balance |  |  | (238.9) |
Continuing Operations | Effective Portion of Cash Flow Hedges |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (211.9) |  |  |
Other comprehensive income (loss) before reclassifications | (133.8) |  |  |
Net amount reclassified from accumulated other comprehensive loss | 13.0 |  |  |
Net other comprehensive income (loss) | (120.8) |  |  |
Ending balance | (332.7) | (211.9) |  |
Discontinued Operations |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Net other comprehensive income (loss) | 0.0 | 56.8 | 14.3 |
Discontinued Operations | Accumulated Other Comprehensive Loss |  |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 0.0 | (56.8) | (71.1) |
Other comprehensive income (loss) before reclassifications | 0.0 | (27.2) | 12.2 |
Net amount reclassified from accumulated other comprehensive loss | 0.0 | 84.0 | 2.1 |
Net other comprehensive income (loss) | 0.0 | 56.8 | 14.3 |
Ending balance | $ 0.0 | $ 0.0 | $ (56.8) |

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