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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
AOCI Attributable to Parent [Abstract] |  |  |
Beginning balance | $ 10,649.8 |  |
Other comprehensive income (loss) before reclassifications | (518.2) | $ 247.7 | $ 1,795.4
Net amount reclassified from accumulated other comprehensive loss | (35.8) | (250.8) | (357.9)
Other comprehensive income (loss), net of tax (Note 17) | (482.4) | 498.5 | 2,153.3
Ending balance | 10,771.9 | 10,649.8 |
Accumulated Other Comprehensive Loss |  |  |
AOCI Attributable to Parent [Abstract] |  |  |
Beginning balance | (3,844.6) | (4,343.1) | (6,496.4)
Other comprehensive income (loss), net of tax (Note 17) | (482.4) | 498.5 | 2,153.3
Ending balance | (4,327.0) | (3,844.6) | (4,343.1)
Foreign currency translation gains/losses |  |  |
AOCI Attributable to Parent [Abstract] |  |  |
Beginning balance | (1,874.2) | (1,550.2) | (1,427.5)
Other comprehensive income (loss) before reclassifications | 78.9 | (324.4) | (122.7)
Net amount reclassified from accumulated other comprehensive loss | 23.7 | (0.4) | 0.0
Other comprehensive income (loss), net of tax (Note 17) | 55.2 | (324.0) | (122.7)
Ending balance | (1,819.0) | (1,874.2) | (1,550.2)
Net unrealized gains/losses on available-for-sale securities |  |  |
AOCI Attributable to Parent [Abstract] |  |  |
Beginning balance | (37.1) | 3.7 | 14.8
Other comprehensive income (loss) before reclassifications | 10.1 | (52.2) | (11.9)
Net amount reclassified from accumulated other comprehensive loss | (0.8) | (11.4) | (0.8)
Other comprehensive income (loss), net of tax (Note 17) | 10.9 | (40.8) | (11.1)
Ending balance | (26.2) | (37.1) | 3.7
Retirement benefit plans |  |  |
AOCI Attributable to Parent [Abstract] |  |  |
Beginning balance | (2,062.3) | (2,583.6) | (4,751.0)
Other comprehensive income (loss) before reclassifications | (686.9) | 291.5 | 1,823.4
Net amount reclassified from accumulated other comprehensive loss | (51.9) | (229.8) | (344.0)
Other comprehensive income (loss), net of tax (Note 17) | (635.0) | 521.3 | 2,167.4
Ending balance | (2,697.3) | (2,062.3) | (2,583.6)
Net unrealized gains/losses on cash flow hedges |  |  |
AOCI Attributable to Parent [Abstract] |  |  |
Beginning balance | 129.0 | (213.0) | (332.7)
Other comprehensive income (loss) before reclassifications | 79.7 | 332.8 | 106.6
Net amount reclassified from accumulated other comprehensive loss | (6.8) | (9.2) | (13.1)
Other comprehensive income (loss), net of tax (Note 17) | 86.5 | 342.0 | 119.7
Ending balance | $ 215.5 | $ 129.0 | $ (213.0)

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