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Business Combinations - Hetsco Acquisition (Details) - USD ($) $ in Millions |  | 3 Months Ended
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Jan. 13, 2017 | Mar. 31, 2018 | Mar. 31, 2017
Business Acquisition |  |  |
Payment for acquisition of businesses, net of cash acquired |  | $ 12.5 | $ 23.2
Hetsco |  |  |
Business Acquisition |  |  |
Voting percentage acquired | 100.00% |  |
Payment for acquisition of businesses, net of cash acquired | $ 22.8 |  |

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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) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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