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Acquisitions JJE acquisition (Details) - USD ($) $ in Millions | Jun. 03, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 236.5 | $ 231.6 | $ 235.2
Joe Johnson Equipment [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Purchase price, inclusive of working capital adjustment | $ 96.6 |  |  |
Estimated fair value of additional consideration | 10.3 |  |  |
Settlement of pre-existing contractual relationship | 11.4 |  |  |
Total consideration | 118.3 |  |  |
Accounts Receivable | 12.1 |  |  |
Inventory | 28.7 |  |  |
Prepaid expenses and other current assets | 0.8 |  |  |
Rental Equipment | 75.9 |  |  |
Properties and equipment | 2.0 |  |  |
Intangible assets | 8.4 |  |  |
Capital lease obligations | (0.5) |  |  |
Accounts payable | (11.5) |  |  |
Customer deposits | (0.8) |  |  |
Accrued liabilities | (2.0) |  |  |
Net assets acquired | 113.1 |  |  |
Goodwill | 5.2 |  |  |
Joe Johnson Equipment [Member] | Deferred Payment [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated fair value of additional consideration | 5.4 |  |  |
Joe Johnson Equipment [Member] | Earn-Out Payment [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated fair value of additional consideration | $ 4.9 |  |  |

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