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Financial Instruments (Narrative) (Details) € in Millions, ¥ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2023 EUR (€) | Dec. 31, 2023 CNY (¥)
Derivative [Line Items] |  |  |  |  |
Net investment gains (loss) on equity securities | $ (20.2) | $ (410.7) | $ 176.9 |  |
Unfunded commitments to invest in venture capital funds | $ 930.0 |  |  |  |
Unfunded commitments to invest in venture capital funds, anticipated payment period | 10 years |  |  |  |
Percentage of nonperforming assets | 99.00% |  |  |  |
Accounts receivable derecognized | $ 431.9 | 422.1 |  |  |
Average remaining maturity of foreign currency derivatives | 12 months |  |  |  |
Maximum remaining maturity of foreign currency derivatives | 180 days |  |  |  |
Long-term debt | $ 19,104.6 | 14,815.3 |  |  |
Foreign currency-denominated notes, designated as hedge | $ 5,670.0 | 5,450.0 |  |  |
Variable rate | 12.00% |  |  | 12.00% | 12.00%
Losses expected to be reclassified in the next 12 months | $ 13.0 |  |  |  |
Swap U.S Dollars To Euro |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative liability, notional amount | 728.6 |  |  |  |
Swap Swiss Francs to USD |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative liability, notional amount | 1,000.0 |  |  |  |
Sell Euro |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative asset, notional amount | € |  |  |  | € 3,200 |
Sell Chinese Yuan |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative asset, notional amount | ¥ |  |  |  |  | ¥ 1,800
Forward-starting interest rate swaps | Cash flow hedges | Designated as Hedging Instrument |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, notional amount | 1,100.0 |  |  |  |
Foreign Currency Denominated Debt |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Long-term debt | $ 7,140.0 | $ 6,830.0 |  |  |

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