Acquisitions JJE acquisition (Details) - USD ($) $ in Millions	Jun. 03, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
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