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Financial Instruments (Narrative) (Details) € in Millions, ¥ in Millions, £ in Millions, $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2021 EUR (€) | Mar. 31, 2021 JPY (¥) | Mar. 31, 2021 GBP (£) | Dec. 31, 2020 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Maximum remaining maturity of foreign currency derivatives | 30 days |  |  |  |  |
Derivatives used in net investment hedge, net of tax | $ 4,300.0 |  |  |  |  | $ 4,500.0
Percentage of long-term fixed-rate notes to floating rates through the use of interest rate swaps converted | 13.00% |  | 13.00% | 13.00% | 13.00% |
Pretax net losses on cash flow hedges expected to be reclassified during the next 12 months | $ 16.9 |  |  |  |  |
Alternative investments, unfunded commitments | $ 736.0 |  |  |  |  |
Alternative investments, unfunded commitments, payment period | 10 years |  |  |  |  |
Equity securities, net unrealized gains | $ 301.5 | $ 186.6 |  |  |  |
Available-for-sale, percentage of nonperforming assets | 94.00% |  |  |  |  |
Amount of receivable derecognized | $ 637.8 |  |  |  |  | 754.9
Buy U.S. Dollars Sell Euros |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Derivative liability, notional amount | 1,110.0 |  |  |  |  |
Derivative asset, notional amount | € |  |  | € 941.7 |  |  |
Buy Euros Sell U.S. Dollars |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Derivative liability, notional amount | € |  |  | € 4,190.0 |  |  |
Derivative asset, notional amount | 4,980.0 |  |  |  |  |
Buy U.S. Dollars Sell Japanese Yen |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Derivative liability, notional amount | 140.7 |  |  |  |  |
Derivative asset, notional amount | ¥ |  |  |  | ¥ 15,470 |  |
Buy British Pounds and Sell U.S. Dollars |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Derivative liability, notional amount | £ |  |  |  |  | £ 285.2 |
Derivative asset, notional amount | 396.5 |  |  |  |  |
Swap U.S. Dollars to Euro |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Derivative, notional amount | 3,790.0 |  |  |  |  |
Swap Swiss Francs to U.S. Dollars |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Derivative, notional amount | 1,000.0 |  |  |  |  |
Foreign Currency Denominated Debt |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Long-term debt, including current portion | 5,720.0 |  |  |  |  | $ 6,020.0
Designated as Hedging Instrument | Cash Flow Hedging | Forward-starting interest rate swaps |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Derivative, notional amount | $ 1,750.0 |  |  |  |  |

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