Business Combinations - Summary of Net Assets Acquired from Acquisition (Details) - USD ($) $ in Millions						12 Months Ended
	Oct. 30, 2020	Sep. 01, 2020	Jul. 01, 2020	Jun. 12, 2020	Feb. 14, 2020	Dec. 31, 2020	Dec. 31, 2019	May 01, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill						$ 24.3	$ 8.6		$ 7.6
Assets acquired net of cash			$ 2.1	$ 3.0		180.0	$ 65.6
FlaglerCE Holdings LLC
Business Acquisition [Line Items]
Cash					$ 0.4
Accounts receivable					15.1
Inventory					37.5
Prepaid and other assets					0.5
Rental fleet, net					47.8
Property and equipment, net					2.9
Intangible assets					14.6
Goodwill					5.8
Total Assets					124.6
Floor plan payable					(29.0)
Accounts payable					(14.0)
Accrued expenses					(4.1)
Other liabilities					(1.3)
Total Liabilities					(48.4)
Net Assets Acquired					76.2
Assets acquired net of cash					75.8
Liftech Equipment Companies, Inc.
Business Acquisition [Line Items]
Accounts receivable					4.4
Inventory					9.6
Prepaid and other assets					1.0
Rental fleet, net					4.7
Property and equipment, net					1.2
Intangible assets					1.2
Goodwill					1.5
Total Assets					23.6
Floor plan payable					(3.5)
Accounts payable					(1.6)
Other current liabilities					(0.1)
Total Liabilities					(5.2)
Net Assets Acquired					18.4
Assets acquired net of cash					$ 18.4
Peak Logix LLC
Business Acquisition [Line Items]
Cash				3.0
Accounts receivable				4.6
Inventory				0.4
Prepaid and other assets				0.2
Property and equipment, net				0.2
Intangible assets				5.8
Goodwill				0.7
Total Assets				14.9
Accounts payable				(1.5)
Accrued expenses				(0.1)
Other current liabilities				(3.9)
Total Liabilities				(5.5)
Net Assets Acquired				9.4
Assets acquired net of cash				$ 6.4
Hilo Equipment & Services
Business Acquisition [Line Items]
Cash			2.1
Accounts receivable			5.4
Inventory			4.7
Prepaid and other assets			0.2
Rental fleet, net			7.5
Property and equipment, net			1.7
Intangible assets			2.4
Goodwill			3.2
Total Assets			27.2
Floor plan payable			(4.4)
Accounts payable			(2.8)
Accrued expenses			(0.3)
Other current liabilities			(0.4)
Total Liabilities			(7.9)
Net Assets Acquired			19.3
Assets acquired net of cash			$ 17.2
Martin Implement Sales, Inc.
Business Acquisition [Line Items]
Accounts receivable		$ 1.0
Inventory		6.8
Rental fleet, net		6.3
Intangible assets		1.5
Goodwill		0.8
Total Assets		16.4
Accounts payable		(0.2)
Accrued expenses		(0.1)
Total Liabilities		(0.3)
Net Assets Acquired		16.1
Assets acquired net of cash		$ 16.1
Howell Tractor and Equipment, LLC
Business Acquisition [Line Items]
Accounts receivable	$ 5.3
Inventory	6.3
Rental fleet, net	12.4
Property and equipment, net	1.1
Goodwill	3.2
Total Assets	28.3
Floor plan payable	(0.8)
Accounts payable	(1.0)
Accrued expenses	(0.1)
Total Liabilities	(1.9)
Net Assets Acquired	26.4
Assets acquired net of cash	$ 26.4
Flagler, Liftech, Peak, Hilo, Martin, Howell and Vantage
Business Acquisition [Line Items]
Cash						5.5
Accounts receivable						39.4
Inventory						72.9
Prepaid and other assets						2.3
Rental fleet, net						94.6
Property and equipment, net						8.0
Intangible assets						25.5
Goodwill						15.7
Total Assets						263.9
Floor plan payable						(40.2)
Accounts payable						(22.6)
Accrued expenses						(5.3)
Other current liabilities						(4.5)
Other liabilities						(1.3)
Total Liabilities						(73.9)
Net Assets Acquired						190.0
Assets acquired net of cash						184.5
Vantage Equipment, LLC
Business Acquisition [Line Items]
Accounts receivable						3.6
Inventory						7.6
Prepaid and other assets						0.4
Rental fleet, net						15.9
Property and equipment, net						0.9
Goodwill						0.5
Total Assets						28.9
Floor plan payable						(2.5)
Accounts payable						(1.5)
Accrued expenses						(0.6)
Other current liabilities						(0.1)
Total Liabilities						(4.7)
Net Assets Acquired						24.2
Assets acquired net of cash						$ 24.2
Northland Industrial Truck Co., Inc
Business Acquisition [Line Items]
Accounts receivable								$ 13.9
Other current & non-current assets								0.5
Inventory								35.7
Guaranteed purchase obligation asset								9.7
Property and equipment, net								18.8
Identifiable intangible assets								3.3
Goodwill								1.0
Total Assets								82.9
Accounts payable								(5.2)
Guaranteed purchase obligation liability								(9.7)
Capital lease obligations								(1.3)
Other liabilities								(1.1)
Total Liabilities								(17.3)
Net Assets Acquired								$ 65.6