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Summary of Significant Accounting Policies Derivatives Pretax Amounts Affecting Income and Other Comprehensive Income (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Cash Flow Hedging [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) Recognized in Accumulated OCI on Derivative (Effective Portion) | $ (167.4) | $ 22.5
Gain (Loss) Reclassified into Income from Accumulated OCI (Effective Portion) | (7.5) | 49.0
Net Investment Hedging Relationships |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) Recognized in Accumulated OCI on Derivative (Effective Portion) | (1,002.0) | 329.1
Gain (Loss) Reclassified into Income from Accumulated OCI (Effective Portion) | 33.7 |
Gain (Loss) Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing and Ineffective Portion) | 14.7 | 11.7
Interest rate | Cash Flow Hedging [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) Recognized in Accumulated OCI on Derivative (Effective Portion) | (90.8) |
Gain (Loss) Reclassified into Income from Accumulated OCI (Effective Portion) | (5.4) | (1.3)
Foreign currency denominated debt | Net Investment Hedging Relationships |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) Recognized in Accumulated OCI on Derivative (Effective Portion) | (989.7) | 317.3
Gain (Loss) Reclassified into Income from Accumulated OCI (Effective Portion) | 33.7 |
Foreign currency | Cash Flow Hedging [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) Recognized in Accumulated OCI on Derivative (Effective Portion) | (76.6) | 22.5
Gain (Loss) Reclassified into Income from Accumulated OCI (Effective Portion) | (2.1) | 50.3
Foreign currency derivatives | Net Investment Hedging Relationships |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) Recognized in Accumulated OCI on Derivative (Effective Portion) | (12.3) | 11.8
Cross Currency Interest Rate Contract [Member] | Net Investment Hedging Relationships |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing and Ineffective Portion) | 14.7 | 11.7
Not Designated as Hedging Instrument [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) Recognized in Income on Derivative | (0.6) | 86.0
Not Designated as Hedging Instrument [Member] | Foreign currency |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) Recognized in Income on Derivative | (29.0) | 14.2
Not Designated as Hedging Instrument [Member] | Equity |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) Recognized in Income on Derivative | 44.4 | $ 71.8
Not Designated as Hedging Instrument [Member] | Equity Contract [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) Recognized in Income on Derivative | $ (16.0) |

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959 + Details
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- Definition The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=121577467&loc=d3e76258-113986 + Details
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