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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, 2019 | Dec. 31, 2018
Cash Flow Hedging [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) Recognized in Accumulated OCI on Derivative (Effective Portion) | $ 22.5 | $ 60.0
Gain (Loss) Reclassified into Income from Accumulated OCI (Effective Portion) | 49.0 | (3.4)
Net Investment Hedging Relationships |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) Recognized in Accumulated OCI on Derivative (Effective Portion) | 329.1 | 684.2
Gain (Loss) Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing and Ineffective Portion) | 11.7 | 4.0
Interest rate | Cash Flow Hedging [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) Recognized in Accumulated OCI on Derivative (Effective Portion) |  |
Gain (Loss) Reclassified into Income from Accumulated OCI (Effective Portion) | (1.3) | (1.2)
Foreign currency denominated debt | Net Investment Hedging Relationships |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) Recognized in Accumulated OCI on Derivative (Effective Portion) | 317.3 | 682.9
Foreign currency | Cash Flow Hedging [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) Recognized in Accumulated OCI on Derivative (Effective Portion) | 22.5 | 60.0
Gain (Loss) Reclassified into Income from Accumulated OCI (Effective Portion) | 50.3 | (2.2)
Foreign currency derivatives | Net Investment Hedging Relationships |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) Recognized in Accumulated OCI on Derivative (Effective Portion) | 11.8 | 1.3
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) | 11.7 | 4.0
Not Designated as Hedging Instrument [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) Recognized in Income on Derivative | 86.0 | 22.5
Not Designated as Hedging Instrument [Member] | Foreign currency |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) Recognized in Income on Derivative | 14.2 | 22.1
Not Designated as Hedging Instrument [Member] | Equity |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Gain (Loss) Recognized in Income on Derivative | $ 71.8 | $ 0.4

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