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Acquisitions (Details) $ in Millions		3 Months Ended		6 Months Ended
	Jan. 01, 2016 USD ($)	Mar. 31, 2016 USD ($) item	Mar. 31, 2015 item	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)
Acquisitions
Number of acquisitions | item		2
Environmental Air Systems
Acquisitions
Total purchase price	$ 47.0
Interest acquired (as a percent)	40.00%
Purchase price paid in cash	$ 42.0
Shoffner
Acquisitions
Total purchase price				$ 19.2
Interest acquired (as a percent)		100.00%
Amount allocated to goodwill and identifiable intangible assets for acquisitions				13.7
Revenue in consolidated results				36.0
Purchase price paid in cash				$ 15.5
Other Acquisitions
Acquisitions
Total purchase price					$ 6.7
Number of acquisitions | item			2
Purchase price paid in cash		$ 0.8

X

- Definition

Represents the amount allocated to goodwill and intangible assets on the acquisition date.

+ References

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- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
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- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
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- Definition

This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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- Definition

The number of businesses acquired by the entity during the period.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

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