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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, 2018	Dec. 31, 2017
Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Accumulated OCI on Derivative (Effective Portion)	$ 60.0	$ (76.0)
Gain (Loss) Reclassified into Income from Accumulated OCI (Effective Portion)	(3.4)	(14.2)
Net Investment Hedging Relationships
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Accumulated OCI on Derivative (Effective Portion)	684.2	(1,608.6)
Gain (Loss) Reclassified into Income from Accumulated OCI (Effective Portion)	0.0	8.6
Gain (Loss) Recognized in Income on Derivative (Amount Excluded from Effectiveness Testing and Ineffective Portion)	4.0	0.0
Interest rate | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Accumulated OCI on Derivative (Effective Portion)	0.0	0.0
Gain (Loss) Reclassified into Income from Accumulated OCI (Effective Portion)	(1.2)	(0.5)
Foreign currency denominated debt | Net Investment Hedging Relationships
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Accumulated OCI on Derivative (Effective Portion)	682.9	(1,599.7)
Gain (Loss) Reclassified into Income from Accumulated OCI (Effective Portion)	0.0	0.0
Foreign currency | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Accumulated OCI on Derivative (Effective Portion)	60.0	(76.0)
Gain (Loss) Reclassified into Income from Accumulated OCI (Effective Portion)	(2.2)	(13.7)
Foreign currency derivatives | Net Investment Hedging Relationships
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Accumulated OCI on Derivative (Effective Portion)	1.3	(8.9)
Gain (Loss) Reclassified into Income from Accumulated OCI (Effective Portion)	0.0	8.6
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)	4.0	0.0
Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivative	22.5	68.5
Not Designated as Hedging Instrument [Member] | Foreign currency
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivative	22.1	(24.2)
Not Designated as Hedging Instrument [Member] | Equity
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivative	$ 0.4	$ 92.7

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Paragraph 4C
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-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

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