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Subsequent Events (Notes)	12 Months Ended
Subsequent Events (Notes)	Dec. 31, 2017
Subsequent Event [Line Items]
Subsequent Events [Text Block]	Subsequent Event We acquired 100% of the equity interests of Skaff Cryogenics and Cryo-Lease, LLC (together “Skaff”) on January 2, 2018 for an approximate purchase price of $12.5. Skaff provides quality repair service and remanufacturing of cryogenic and liquefied natural gas storage tanks and trailers and also maintains a portfolio of cryogenic storage equipment that is leased to customers for temporary and permanent needs. Skaff is headquartered in Brentwood, New Hampshire and provides services and equipment to customers in North America. Skaff’s results will be included in the D&S operating segment.