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Financial Instruments (Narrative) (Details) ¥ in Millions, ¥ in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 EUR (€) | Sep. 30, 2021 CNY (¥) | Sep. 30, 2021 JPY (¥) | Sep. 30, 2021 GBP (£) | Dec. 31, 2020 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum remaining maturity of foreign currency derivatives |  |  |  | 180 days |  |  |  |  |  |
Derivatives used in net investment hedge, net of tax | $ 5,950.0 | $ 5,950.0 |  | $ 5,950.0 |  |  |  |  |  | $ 4,500.0
Percentage of long-term fixed-rate notes to floating rates through the use of interest rate swaps converted | 12.00% | 12.00% |  | 12.00% |  | 12.00% | 12.00% | 12.00% | 12.00% |
Debt extinguishment loss |  | $ 405.2 | $ 0.0 | $ 405.2 | $ 0.0 |  |  |  |  |
Pretax net losses on cash flow hedges expected to be reclassified during the next 12 months | $ 16.4 | 16.4 |  | 16.4 |  |  |  |  |  |
Alternative investments, unfunded commitments | 781.0 | 781.0 |  | $ 781.0 |  |  |  |  |  |
Alternative investments, unfunded commitments, payment period |  |  |  | 10 years |  |  |  |  |  |
Equity securities, net unrealized gains (losses) |  | (246.8) | $ 141.7 | $ 270.1 | $ 905.1 |  |  |  |  |
Available-for-sale, percentage of nonperforming assets |  |  |  | 97.00% |  |  |  |  |  |
Amount of receivable derecognized | 617.4 | 617.4 |  | $ 617.4 |  |  |  |  |  | 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 | 707.3 | 707.3 |  | 707.3 |  |  |  |  |  |
Derivative asset, notional amount | € |  |  |  |  |  | € 604,500,000 |  |  |  |
Buy Euros Sell U.S. Dollars |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative liability, notional amount | € |  |  |  |  |  | 2,540,000,000 |  |  |  |
Derivative asset, notional amount | 2,980.0 | 2,980.0 |  | 2,980.0 |  |  |  |  |  |
Buy US Dollar Sell Chinese Yuan |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative liability, notional amount | 151.6 | 151.6 |  | 151.6 |  |  |  |  |  |
Derivative asset, notional amount | ¥ |  |  |  |  |  |  | ¥ 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 | 144.7 | 144.7 |  | 144.7 |  |  |  |  |  |
Derivative asset, notional amount | ¥ |  |  |  |  |  |  |  | ¥ 16,130 |  |
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 | £ |  |  |  |  |  |  |  |  | £ 155,500,000 |
Derivative asset, notional amount | 212.6 | 212.6 |  | 212.6 |  |  |  |  |  |
Swap U.S. Dollars to Euro |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, notional amount | 2,690.0 | 2,690.0 |  | 2,690.0 |  |  |  |  |  |
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 |  | 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 | 8,080.0 | $ 8,080.0 |  | $ 8,080.0 |  |  |  |  |  | $ 6,020.0
Payment for debt extinguishment | 1,910.0 |  |  |  |  |  |  |  |  |
Extinguishment of debt, amount | 1,500.0 |  |  |  |  |  |  |  |  |
Debt extinguishment loss | $ 405.2 |  |  |  |  |  |  |  |  |
Foreign Currency Denominated Debt | 0.500% Notes due 2033 |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | € |  |  |  |  |  | € 600,000,000 |  |  |  |
Stated interest rate | 0.50% | 0.50% |  | 0.50% |  | 0.50% | 0.50% | 0.50% | 0.50% |
Foreign Currency Denominated Debt | 1.125% Notes due 2051 |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | € |  |  |  |  |  | € 500,000,000 |  |  |  |
Stated interest rate | 1.125% | 1.125% |  | 1.125% |  | 1.125% | 1.125% | 1.125% | 1.125% |
Foreign Currency Denominated Debt | 1.375% Notes due 2061 |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | € |  |  |  |  |  | € 700,000,000 |  |  |  |
Stated interest rate | 1.375% | 1.375% |  | 1.375% |  | 1.375% | 1.375% | 1.375% | 1.375% |
Foreign Currency Denominated Debt | 1.625% Notes due 2043 |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount | £ |  |  |  |  |  |  |  |  | £ 250,000,000 |
Stated interest rate | 1.625% | 1.625% |  | 1.625% |  | 1.625% | 1.625% | 1.625% | 1.625% |
Foreign Currency Denominated Debt | 3.95% Notes Due 2049 |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate | 3.95% | 3.95% |  | 3.95% |  | 3.95% | 3.95% | 3.95% | 3.95% |
Extinguishment of debt, amount | $ 541.8 |  |  |  |  |  |  |  |  |
Foreign Currency Denominated Debt | 4.15% Notes Due 2059 |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate | 4.15% | 4.15% |  | 4.15% |  | 4.15% | 4.15% | 4.15% | 4.15% |
Extinguishment of debt, amount | $ 408.7 |  |  |  |  |  |  |  |  |
Foreign Currency Denominated Debt | 3.375% Notes Due 2029 |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate | 3.375% | 3.375% |  | 3.375% |  | 3.375% | 3.375% | 3.375% | 3.375% |
Extinguishment of debt, amount | $ 219.4 |  |  |  |  |  |  |  |  |
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 |  | $ 1,750.0 |  |  |  |  |  |

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