Acquisitions (Narrative - BakerCorp Acquisition) (Details) $ in Millions	1 Months Ended
Jul. 31, 2018 USD ($) employee branch location
BakerCorp
Business Acquisition [Line Items]
Number of entity employees \| employee	950
BakerCorp \| United States and Canada
Business Acquisition [Line Items]
Number of branch locations \| location	46
BakerCorp \| France, Germany, United Kingdom, and Netherlands
Business Acquisition [Line Items]
Number of branch locations \| location	11
BakerCorp
Business Acquisition [Line Items]
Revenue reported by acquired entity for last annual period \| $	$ 295
Consideration transferred \| $	$ 720
BakerCorp \| France, Germany, United Kingdom, and Netherlands
Business Acquisition [Line Items]
Number of branch locations \| branch	11

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6613-128477

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6578-128477

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration