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Restructuring - Summary of Restructuring Activities (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restructuring Reserve [Roll Forward]
Accrual as of beginning of period	$ 74.0	$ 71.8	$ 50.2
Charges	70.9	63.6	81.1
Utilization, Cash	(45.6)	(56.7)	(53.6)
Utilization, Non-cash	(1.3)	(4.7)	(5.9)
Accrual as of end of period	98.0	74.0	71.8
Employee termination benefits
Restructuring Reserve [Roll Forward]
Accrual as of beginning of period	69.4	66.5	45.1
Charges	62.9	54.1	70.0
Utilization, Cash	(39.3)	(51.2)	(48.6)
Utilization, Non-cash	0.0	0.0	0.0
Accrual as of end of period	93.0	69.4	66.5
Asset impairments
Restructuring Reserve [Roll Forward]
Accrual as of beginning of period	0.0	0.0	0.0
Charges	1.3	4.7	3.9
Utilization, Cash	0.0	0.0	0.0
Utilization, Non-cash	(1.3)	(4.7)	(3.9)
Accrual as of end of period	0.0	0.0	0.0
Contract termination costs
Restructuring Reserve [Roll Forward]
Accrual as of beginning of period	4.6	5.3	5.1
Charges	1.7	0.1	1.7
Utilization, Cash	(1.3)	(0.8)	(1.5)
Utilization, Non-cash	0.0	0.0	0.0
Accrual as of end of period	5.0	4.6	5.3
Other related costs
Restructuring Reserve [Roll Forward]
Accrual as of beginning of period	0.0	0.0	0.0
Charges	5.0	4.7	5.5
Utilization, Cash	(5.0)	(4.7)	(3.5)
Utilization, Non-cash	0.0	0.0	(2.0)
Accrual as of end of period	$ 0.0	$ 0.0	$ 0.0

X

- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

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-Publisher FASB
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-Section 45
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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

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Amount of decrease in the reserve for full or partial settlement through consideration other than cash.

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-Topic 420
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