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Summary of Debt Obligations (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Debt Disclosure [Line Items] |  |  |  |
Amounts outstanding |  | $ 37,440.4 |  | $ 34,177.2
Deferred Finance Costs, Own-share Lending Arrangement, Issuance Costs, Net |  | 156.2 |  | 140.4
Debt Obligations Before Fair Value Adjustments |  |  |  |
Debt Disclosure [Line Items] |  |  |  |
Amounts outstanding |  | 37,560.8 | [1] | 34,305.5
Fair Value Hedging [Member] |  |  |  |
Debt Disclosure [Line Items] |  |  |  |
Amounts outstanding | [2] | 35.8 |  | 12.1
Currency US Dollar |  |  |  |
Debt Disclosure [Line Items] |  |  |  |
Amounts outstanding |  | $ 23,884.5 |  | $ 21,389.5
Currency US Dollar | Fixed Rate Debt |  |  |  |
Debt Disclosure [Line Items] |  |  |  |
Interest rates | [3] | 3.90% |  | 4.00%
Amounts outstanding |  | $ 22,734.5 |  | $ 19,340.2
Currency US Dollar | Floating Rate Debt |  |  |  |
Debt Disclosure [Line Items] |  |  |  |
Interest rates | [3] | 0.90% |  | 2.20%
Amounts outstanding |  | $ 1,150.0 |  | $ 2,049.3
Currency Euro |  |  |  |
Debt Disclosure [Line Items] |  |  |  |
Amounts outstanding |  | $ 9,820.4 |  | $ 9,008.8
Currency Euro | Fixed Rate Debt |  |  |  |
Debt Disclosure [Line Items] |  |  |  |
Interest rates | [3] | 1.50% |  | 1.50%
Amounts outstanding |  | $ 9,453.9 |  | $ 8,671.8
Currency Euro | Floating Rate Debt |  |  |  |
Debt Disclosure [Line Items] |  |  |  |
Interest rates | [3] | 2.10% |  | 2.30%
Amounts outstanding |  | $ 366.5 |  | $ 337.0
Currency Australian Dollars |  |  |  |
Debt Disclosure [Line Items] |  |  |  |
Amounts outstanding |  | $ 1,075.9 |  | $ 981.6
Currency Australian Dollars | Fixed Rate Debt |  |  |  |
Debt Disclosure [Line Items] |  |  |  |
Interest rates | [3] | 3.40% |  | 3.40%
Amounts outstanding |  | $ 845.1 |  | $ 771.0
Currency Australian Dollars | Floating Rate Debt |  |  |  |
Debt Disclosure [Line Items] |  |  |  |
Interest rates | [3] | 1.20% |  | 2.00%
Amounts outstanding |  | $ 230.8 |  | $ 210.6
Currency Japanese Yen | Fixed Rate Debt |  |  |  |
Debt Disclosure [Line Items] |  |  |  |
Interest rates | [3] | 2.90% |  | 2.90%
Amounts outstanding |  | $ 121.1 |  | $ 115.1
Currency British Pound Sterling [Member] | Fixed Rate Debt |  |  |  |
Debt Disclosure [Line Items] |  |  |  |
Interest rates | [3] | 4.20% |  | 4.60%
Amounts outstanding |  | $ 1,156.4 |  | $ 1,386.3
Currency Canadian Dollar [Member] | Fixed Rate Debt |  |  |  |
Debt Disclosure [Line Items] |  |  |  |
Interest rates | [3] | 3.10% |  | 3.10%
Amounts outstanding |  | $ 784.9 |  | $ 768.6
Foreign currency denominated debt |  |  |  |
Debt Disclosure [Line Items] |  |  |  |
Amounts outstanding | [4] | $ 717.6 |  | $ 655.6
Foreign currency denominated debt | Fixed Rate Debt |  |  |  |
Debt Disclosure [Line Items] |  |  |  |
Interest rates |  | 0.20% |  | 0.20%
Amounts outstanding |  | $ 451.9 |  | $ 413.8
Foreign currency denominated debt | Floating Rate Debt |  |  |  |
Debt Disclosure [Line Items] |  |  |  |
Interest rates |  | 1.90% |  | 2.20%
Amounts outstanding |  | $ 265.7 |  | $ 241.8
[1] | Aggregate maturities for 2020 debt balances, before fair value adjustments and deferred debt costs, are as follows (in millions): 2021–$2,243.6; 2022–$2,332.2; 2023–$2,643.9; 2024–$3,300.7; 2025–$3,159.6; Thereafter–$23,880.8. These amounts include a reclassification of short-term obligations totaling $268.9 million to long-term obligations as they are supported by a long-term line of credit agreement expiring in December 2024
[2] | The carrying value of underlying items in fair value hedges, in this case debt obligations, are adjusted for fair value changes to the extent they are attributable to the risk designated as being hedged. The related hedging instruments are also recorded at fair value on the Consolidated Balance Sheet.
[3] | Weighted-average effective rate, computed on a semi-annual basis.
[4] | onsists of Swiss Francs and Korean Won.

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