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Acquisitions - Summary of Changes to Goodwill Balance (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	9 Months Ended
	Mar. 31, 2017	Mar. 31, 2017	Mar. 31, 2017
Goodwill [Line Items]
Beginning balance			$ 195.3
Working capital adjustment			0.8
Ending balance	$ 315.0	$ 315.0	315.0
Assurex [Member]
Goodwill [Line Items]
Beginning balance		116.3
Fair value adjustment to equipment and intangibles		1.7	1.7
Working capital adjustment		3.1	3.1
Change in deferred tax liability	(0.8)	(1.4)	(1.4)
Ending balance	$ 119.7	$ 119.7	$ 119.7

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- Definition

Goodwill adjustment to deferred tax assets liabilities.

+ References

No definition available.

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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975

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- Definition

Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=73531572&loc=d3e961-128460

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 1
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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Amount of transfers into (out of) an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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-Publisher FASB
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-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
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