Acquisitions (Narrative) (Details)	1 Months Ended		3 Months Ended	6 Months Ended
	Oct. 31, 2018 USD ($) employee location state	Jul. 31, 2018 USD ($) employee location	Jun. 30, 2019	Jun. 30, 2019
Business Acquisition [Line Items]
Increase in average volume of OEC (as a percent)			23.20%	23.40%
BlueLine
Business Acquisition [Line Items]
Revenue reported by acquired entity for last annual period	$ 786,000,000
Aggregate consideration paid	$ 2,072,000,000.000
BakerCorp
Business Acquisition [Line Items]
Revenue reported by acquired entity for last annual period		$ 295,000,000
Aggregate consideration paid		$ 720,000,000
BakerCorp
Business Acquisition [Line Items]
Number of employees | employee		950
BlueLine
Business Acquisition [Line Items]
Number of employees | employee	1,700
Number of rental locations (branch) | location	114
Number of states | state	25
United States and Canada | BakerCorp
Business Acquisition [Line Items]
Number of rental locations (branch) | location		46
France, Germany, United Kingdom and Netherlands | BakerCorp
Business Acquisition [Line Items]
Number of rental locations (branch) | location		11
Line of Credit
Business Acquisition [Line Items]
Maximum borrowing capacity	$ 1,000,000,000
6 1/2 percent Senior Notes due 2026 | Senior notes
Business Acquisition [Line Items]
Stated interest rate			6.50%	6.50%
6 1/2 percent Senior Notes due 2026 | Senior notes | BlueLine
Business Acquisition [Line Items]
Debt instrument, face amount	$ 1,100,000,000
Stated interest rate	6.50%