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Financial Instruments (Narrative) (Details) € in Millions, ¥ in Millions, ¥ in Millions, £ in Millions, $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2022 USD ($) | Mar. 31, 2021 USD ($) | Mar. 31, 2022 EUR (€) | Mar. 31, 2022 CNY (¥) | Mar. 31, 2022 JPY (¥) | Mar. 31, 2022 GBP (£) | Dec. 31, 2021 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Maximum remaining maturity of foreign currency derivatives | 180 days |  |  |  |  |  |
Derivatives used in net investment hedge, net of tax | $ 4,900.0 |  |  |  |  |  | $ 5,790.0
Percentage of long-term fixed-rate notes to floating rates through the use of interest rate swaps converted | 14.00% |  | 14.00% | 14.00% | 14.00% | 14.00% |
Pretax net losses on cash flow hedges expected to be reclassified during the next 12 months | $ 16.5 |  |  |  |  |  |
Alternative investments, unfunded commitments | $ 843.0 |  |  |  |  |  |
Alternative investments, unfunded commitments, payment period | 10 years |  |  |  |  |  |
Equity securities, net unrealized gains (losses) | $ (425.4) | $ 301.5 |  |  |  |  |
Available-for-sale, percentage of nonperforming assets | 97.00% |  |  |  |  |  |
Amount of receivable derecognized | $ 449.5 |  |  |  |  |  | 550.5
Buy U.S. Dollars Sell Euros |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Derivative liability, notional amount | 3,470.0 |  |  |  |  |  |
Derivative asset, notional amount | € |  |  | € 3,130.0 |  |  |  |
Buy Euros Sell U.S. Dollars |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Derivative liability, notional amount | € |  |  | € 5,050.0 |  |  |  |
Derivative asset, notional amount | 5,610.0 |  |  |  |  |  |
Buy US Dollar Sell Chinese Yuan |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Derivative liability, notional amount | 195.6 |  |  |  |  |  |
Derivative asset, notional amount | ¥ |  |  |  | ¥ 1,250.0 |  |  |
Buy U.S. Dollars Sell Japanese Yen |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Derivative liability, notional amount | 89.4 |  |  |  |  |  |
Derivative asset, notional amount | ¥ |  |  |  |  | ¥ 10,850 |  |
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 | £ |  |  |  |  |  | £ 191.6 |
Derivative asset, notional amount | 252.4 |  |  |  |  |  |
Swap U.S. Dollars to Euro |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Derivative, notional amount | 1,020.0 |  |  |  |  |  |
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 | 7,120.0 |  |  |  |  |  | $ 7,900.0
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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