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Financial Instruments (Narrative) (Details) € in Millions, ¥ in Millions, £ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2020 EUR (€) | Dec. 31, 2020 JPY (¥) | Dec. 31, 2020 GBP (£)
Derivative [Line Items] |  |  |  |  |  |
Average remaining maturity of foreign currency derivatives | 12 months |  |  |  |  |
Maximum remaining maturity of foreign currency derivatives | 30 days |  |  |  |  |
Total long-term notes | $ 16,348.7 | $ 13,638.5 |  |  |  |
Foreign currency-denominated notes, designated as hedge | $ 4,500.0 | 4,100.0 |  |  |  |
Variable rate | 9.00% |  |  | 9.00% | 9.00% | 9.00%
Losses expected to be reclassified in the next 12 months | $ 16.8 |  |  |  |  |
Unfunded commitments to invest in venture capital funds | $ 687.0 |  |  |  |  |
Unfunded commitments to invest in venture capital funds, anticipated payment period | 10 years |  |  |  |  |
Unrealized losses from equity securities | $ 1,442.2 | 401.2 | $ 72.6 |  |  |
Percentage of nonperforming assets | 86.00% |  |  |  |  |
Accounts receivable derecognized | $ 754.9 | 678.8 |  |  |  |
Buy USD Sell Euro |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative liability, notional amount | 647.9 |  |  |  |  |
Derivative asset, notional amount | € |  |  |  | € 530.7 |  |
Buy Euro Sell USD |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative liability, notional amount | € |  |  |  | € 2,970.0 |  |
Derivative asset, notional amount | 3,620.0 |  |  |  |  |
Buy USD Sell Japanese Yen |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative liability, notional amount | 180.7 |  |  |  |  |
Derivative asset, notional amount | ¥ |  |  |  |  | ¥ 18,640 |
Buy GBP Sell USD |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative liability, notional amount | £ |  |  |  |  |  | £ 272.2
Derivative asset, notional amount | 363.9 |  |  |  |  |
Currency Swap |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative liability, notional amount | 3,760.0 |  |  |  |  |
Swap Swiss Francs to USD |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative liability, notional amount | 1,000.0 |  |  |  |  |
Foreign Currency Denominated Debt |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Total long-term notes | 6,020.0 | $ 5,490.0 |  |  |  |
Cash flow hedges | Designated as Hedging Instrument | Forward-starting interest rate swaps |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, notional amount | $ 1,750.0 |  |  |  |  |

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