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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
AOCI Attributable to Parent [Abstract] |  |  |
Beginning balance | $ 10,771.9 |  |
Other comprehensive income (loss) before reclassifications | (98.6) | $ (518.2) | $ 247.7
Net amount reclassified from accumulated other comprehensive loss | 103.7 | 35.8 | 250.8
Other comprehensive income (loss), net of tax (Note 17) | 5.1 | (482.4) | 498.5
Ending balance | 14,192.1 | 10,771.9 |
Accumulated Other Comprehensive Loss |  |  |
AOCI Attributable to Parent [Abstract] |  |  |
Beginning balance | (4,327.0) | (3,844.6) | (4,343.1)
Other comprehensive income (loss), net of tax (Note 17) | 5.1 | (482.4) | 498.5
Ending balance | (4,321.9) | (4,327.0) | (3,844.6)
Foreign currency translation gains/losses |  |  |
AOCI Attributable to Parent [Abstract] |  |  |
Beginning balance | (1,819.0) | (1,874.2) | (1,550.2)
Other comprehensive income (loss) before reclassifications | (580.2) | 78.9 | (324.4)
Net amount reclassified from accumulated other comprehensive loss | 9.6 | (23.7) | 0.4
Other comprehensive income (loss), net of tax (Note 17) | (570.6) | 55.2 | (324.0)
Ending balance | (2,389.6) | (1,819.0) | (1,874.2)
Net unrealized gains/losses on available-for-sale securities |  |  |
AOCI Attributable to Parent [Abstract] |  |  |
Beginning balance | (26.2) | (37.1) | 3.7
Other comprehensive income (loss) before reclassifications | (5.0) | 10.1 | (52.2)
Net amount reclassified from accumulated other comprehensive loss | (0.5) | 0.8 | 11.4
Other comprehensive income (loss), net of tax (Note 17) | (5.5) | 10.9 | (40.8)
Ending balance | (31.7) | (26.2) | (37.1)
Retirement benefit plans |  |  |
AOCI Attributable to Parent [Abstract] |  |  |
Beginning balance | (2,697.3) | (2,062.3) | (2,583.6)
Other comprehensive income (loss) before reclassifications | 424.6 | (686.9) | 291.5
Net amount reclassified from accumulated other comprehensive loss | 94.0 | 51.9 | 229.8
Other comprehensive income (loss), net of tax (Note 17) | 518.6 | (635.0) | 521.3
Ending balance | (2,178.7) | (2,697.3) | (2,062.3)
Net unrealized gains/losses on cash flow hedges |  |  |
AOCI Attributable to Parent [Abstract] |  |  |
Beginning balance | 215.5 | 129.0 | (213.0)
Other comprehensive income (loss) before reclassifications | 62.0 | 79.7 | 332.8
Net amount reclassified from accumulated other comprehensive loss | 0.6 | 6.8 | 9.2
Other comprehensive income (loss), net of tax (Note 17) | 62.6 | 86.5 | 342.0
Ending balance | $ 278.1 | $ 215.5 | $ 129.0

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