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Debt Unrealized Gains (Losses) From Debt Hedges Included In Accumulated Other (Detail) - USD ($) $ in Millions	Dec. 31, 2017	Apr. 06, 2017	Dec. 31, 2016	Jan. 26, 2015	Apr. 22, 2014	Aug. 17, 2011	Nov. 21, 2002	Mar. 01, 1999
Debt Instrument [Line Items]
Unrealized Gain (Loss)	$ (14.8)		$ (9.4)
3.75% Senior Notes due 2021
Debt Instrument [Line Items]
Unrealized Gain (Loss)	(2.1)					$ (5.1)
6 5/8% Senior Notes due 2029
Debt Instrument [Line Items]
Unrealized Gain (Loss)	(2.7)							$ (4.2)
6.25% Senior Notes due 2032
Debt Instrument [Line Items]
Unrealized Gain (Loss)	3.6						$ 5.1
4.35% Senior Notes due 2044
Debt Instrument [Line Items]
Unrealized Gain (Loss)	(1.5)				$ (1.6)
3.70% Senior Notes due 2045
Debt Instrument [Line Items]
Unrealized Gain (Loss)	(12.2)			$ (12.9)
4.125% Senior Notes due 2047
Debt Instrument [Line Items]
Unrealized Gain (Loss)	$ (7.9)	$ (8.0)

X

- Definition

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80784-113994

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- Definition

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+ References

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