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Business Combinations Hetsco Acquisition (Details) - USD ($) $ in Millions | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Mar. 31, 2017 | Jan. 13, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Business Acquisition [Line Items] |  |  |  |  |
Goodwill | $ 468.8 |  |  | $ 218.0 | $ 218.4
Hetsco [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired |  |  | 100.00% |  |
Goodwill | 8.8 | $ 10.1 |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Goodwill | (1.3) |  |  |  |
Customer relationships acquired | 8.1 | 7.3 |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles | 0.8 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 1.2 | 1.2 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net | 4.7 | 4.6 |  |  |
Business Combination Provisional Information Initial Accounting Incomplete, other net assets | 0.1 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net | 22.8 | $ 23.2 |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net | $ (0.4) |  |  |  |

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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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