Segment Information (Percentage of Equipment Rental Revenue by Equipment Type) (Details) - Equipment rental revenue - Product concentration risk	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
General construction and industrial equipment | General rentals
Segment Reporting Information [Line Items]
Percentage of equipment rental revenue	42.00%	43.00%	43.00%
Aerial work platforms | General rentals
Segment Reporting Information [Line Items]
Percentage of equipment rental revenue	26.00%	27.00%	28.00%
General tools and light equipment | General rentals
Segment Reporting Information [Line Items]
Percentage of equipment rental revenue	8.00%	8.00%	8.00%
Power and HVAC equipment | Specialty
Segment Reporting Information [Line Items]
Percentage of equipment rental revenue	9.00%	9.00%	8.00%
Trench safety equipment | Specialty
Segment Reporting Information [Line Items]
Percentage of equipment rental revenue	6.00%	6.00%	6.00%
Fluid solutions equipment | Specialty
Segment Reporting Information [Line Items]
Percentage of equipment rental revenue	7.00%	7.00%	7.00%
Mobile storage equipment and modular office space | Specialty
Segment Reporting Information [Line Items]
Percentage of equipment rental revenue	2.00%	0.00%	0.00%