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Financial Instruments (Narrative) (Details) € in Millions, ¥ in Millions, £ in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 EUR (€) | Jun. 30, 2021 JPY (¥) | Jun. 30, 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 | $ 4,360.0 |  | $ 4,360.0 |  |  |  |  | $ 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% | 13.00% |
Pretax net losses on cash flow hedges expected to be reclassified during the next 12 months | $ 17.0 |  | $ 17.0 |  |  |  |  |
Alternative investments, unfunded commitments | 758.0 |  | $ 758.0 |  |  |  |  |
Alternative investments, unfunded commitments, payment period |  |  | 10 years |  |  |  |  |
Equity securities, net unrealized gains | 215.4 | $ 576.8 | $ 517.0 | $ 763.4 |  |  |  |
Available-for-sale, percentage of nonperforming assets |  |  | 98.00% |  |  |  |  |
Amount of receivable derecognized | 694.3 |  | $ 694.3 |  |  |  |  | 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 | 1,970.0 |  | 1,970.0 |  |  |  |  |
Derivative asset, notional amount | € |  |  |  |  | € 1,650 |  |  |
Buy Euros Sell U.S. Dollars |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Derivative liability, notional amount | € |  |  |  |  | € 2,550 |  |  |
Derivative asset, notional amount | 3,050.0 |  | 3,050.0 |  |  |  |  |
Buy U.S. Dollars Sell Japanese Yen |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Derivative liability, notional amount | 190.8 |  | 190.8 |  |  |  |  |
Derivative asset, notional amount | ¥ |  |  |  |  |  | ¥ 21,100 |  |
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 | £ |  |  |  |  |  |  | £ 250.4 |
Derivative asset, notional amount | 349.4 |  | 349.4 |  |  |  |  |
Swap U.S. Dollars to Euro |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Derivative, notional amount | 3,820.0 |  | 3,820.0 |  |  |  |  |
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 |  | 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 | 5,800.0 |  | 5,800.0 |  |  |  |  | $ 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 |  | $ 1,750.0 |  |  |  |  |

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