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Business Combinations - Schedule of Net Assets Acquired (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Jan. 02, 2018 | Dec. 31, 2017 | Sep. 20, 2017 | Jan. 13, 2017
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Net assets acquired: |  |  |  |  |
Goodwill | $ 475.0 |  | $ 468.8 |  |
Skaff |  |  |  |  |
Net assets acquired: |  |  |  |  |
Goodwill |  | $ 4.7 |  |  |
Property, plant and equipment |  | 4.2 |  |  |
Inventories, net |  | 1.6 |  |  |
Identifiable intangible assets |  | 1.7 |  |  |
Other net assets |  | 0.3 |  |  |
Net assets acquired |  | $ 12.5 |  |  |
Hudson |  |  |  |  |
Net assets acquired: |  |  |  |  |
Goodwill |  |  |  | $ 238.3 |
Property, plant and equipment |  |  |  | 29.4 |
Inventories, net |  |  |  | 26.5 |
Identifiable intangible assets |  |  |  | 211.0 |
Accounts receivable |  |  |  | 34.6 |
Other current assets |  |  |  | 8.1 |
Unbilled contract revenue |  |  |  | 4.9 |
Other assets |  |  |  | 2.9 |
Prepaid expenses |  |  |  | 0.9 |
Deferred tax liabilities |  |  |  | (87.6) |
Accounts payable |  |  |  | (21.2) |
Customer advances and billings in excess of contract revenue |  |  |  | (17.4) |
Accrued salaries, wages and benefits |  |  |  | (4.4) |
Other current liabilities |  |  |  | (3.8) |
Other long-term liabilities |  |  |  | (1.9) |
Current portion of warranty reserve |  |  |  | (0.8) |
Net assets acquired |  |  |  | $ 419.5 |
Hetsco |  |  |  |  |
Net assets acquired: |  |  |  |  |
Goodwill |  |  |  |  | $ 8.8
Other net assets |  |  |  |  | 4.7
Net assets acquired |  |  |  |  | 22.8
Hetsco | Customer relationships |  |  |  |  |
Net assets acquired: |  |  |  |  |
Identifiable intangible assets |  |  |  |  | 8.1
Hetsco | Other identifiable intangible assets |  |  |  |  |
Net assets acquired: |  |  |  |  |
Identifiable intangible assets |  |  |  |  | $ 1.2

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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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