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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, 2021	Dec. 31, 2020
Undesignated derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Undesignated Derivatives	$ 97.4	$ (0.6)
Cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in AOCI	74.2	(167.4)
Gain (loss) reclassified into income from AOCI	(37.2)	(7.5)
Net investment hedges
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in AOCI	766.0	(1,002.0)
Gain (loss) reclassified into income from AOCI	47.1	33.7
Gain (Loss) Recognized in Income on Net Investment Hedges	14.7	14.7
Foreign currency | Undesignated derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Undesignated Derivatives	9.4	(29.0)
Foreign currency | Cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in AOCI	74.2	(76.6)
Gain (loss) reclassified into income from AOCI	(30.9)	(2.1)
Interest rate | Cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in AOCI	0.0	(90.8)
Gain (loss) reclassified into income from AOCI	(6.3)	(5.4)
Foreign currency denominated debt | Net investment hedges
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in AOCI	725.8	(989.7)
Gain (loss) reclassified into income from AOCI	47.1	33.7
Foreign currency derivatives | Net investment hedges
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in AOCI	40.2	(12.3)
Foreign currency derivatives | Net investment hedges
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Net Investment Hedges	14.7	14.7
Equity | Undesignated derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Undesignated Derivatives	99.3	44.4
Equity | Undesignated derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Undesignated Derivatives	$ (11.3)	$ (16.0)

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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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