Schedule II - Valuation And Qualifying Accounts (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance as of Beginning of Period	$ 536.0	$ 677.1	$ 663.6
Additions	66.0	48.9	66.7
Retirements	(30.4)	(127.0)	(69.4)
Other Changes	(41.5)	(63.0)	16.2
Balance as of End of Period	530.1	536.0	677.1
Allowance for doubtful accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance as of Beginning of Period	27.5	34.5	35.4
Additions	14.1	7.6	11.8
Retirements	(4.5)	(10.0)	(13.9)
Other Changes	(2.7)	(4.6)	1.2
Balance as of End of Period	34.4	27.5	34.5
Allowance for deferred tax assets
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance as of Beginning of Period	508.5	642.6	628.2
Additions	51.9	41.3	54.9
Retirements	(25.9)	(117.0)	(55.5)
Other Changes	(38.8)	(58.4)	15.0
Balance as of End of Period	$ 495.7	$ 508.5	$ 642.6

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Total of the adjustments in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 09
-Article 12

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Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

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Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively.

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