Business Combinations - Summary of Net Assets Acquired from Acquisition (Details) - USD ($) $ in Millions						3 Months Ended
	Dec. 31, 2021	Dec. 01, 2021	Oct. 01, 2021	Sep. 01, 2021	Mar. 01, 2021	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Goodwill	$ 41.9					$ 43.5		$ 24.3
Assets acquired net of cash						$ 1.2	$ 1.9
ScottTech
Business Acquisition [Line Items]
Cash					$ 0.5
Accounts receivable					0.9
Inventory					0.3
Prepaid and other assets					0.1
Property and equipment, net					0.4
Intangible assets					0.9
Goodwill					0.6
Total Assets					3.7
Accounts payable					(0.3)
Accrued expenses					(0.1)
Other current liabilities					(0.9)
Total Liabilities					(1.3)
Net Assets Acquired					2.4
Assets acquired net of cash					$ 1.9
Baron
Business Acquisition [Line Items]
Inventory				$ 0.3
Prepaid and other assets				0.3
Property and equipment, net				0.2
Goodwill				0.8
Total Assets				1.6
Other current liabilities				(0.3)
Total Liabilities				(0.3)
Net Assets Acquired				1.3
Assets acquired net of cash				$ 1.3
Gibson
Business Acquisition [Line Items]
Accounts receivable			$ 2.4
Inventory			3.6
Prepaid and other assets			0.5
Rental fleet, net			8.8
Property and equipment, net			1.0
Goodwill			0.3
Total Assets			16.6
Floor plan payable			(4.4)
Accounts payable			(0.6)
Accrued expenses			(0.3)
Other liabilities			(0.7)
Total Liabilities			(6.0)
Net Assets Acquired			10.6
Assets acquired net of cash			$ 10.6
Midwest Mine
Business Acquisition [Line Items]
Cash		$ 0.4
Accounts receivable		3.3
Inventory		1.4
Rental fleet, net		0.9
Property and equipment, net		1.3
Intangible assets		1.3
Goodwill		1.1
Total Assets		9.7
Accounts payable		(1.5)
Accrued expenses		(0.2)
Other current liabilities		(1.1)
Total Liabilities		(2.8)
Net Assets Acquired		6.9
Assets acquired net of cash		$ 6.5
Ambrose
Business Acquisition [Line Items]
Cash	0.2
Accounts receivable	1.5
Inventory	9.0
Rental fleet, net	3.4
Property and equipment, net	0.7
Intangible assets	2.5
Goodwill	3.8
Total Assets	21.1
Floor plan payable	(3.3)
Accounts payable	(1.6)
Accrued expenses	(1.9)
Total Liabilities	(6.8)
Net Assets Acquired	14.3
Assets acquired net of cash	14.1
Ginop
Business Acquisition [Line Items]
Cash	0.7
Accounts receivable	0.4
Inventory	14.7
Intangible assets	15.2
Goodwill	14.0
Total Assets	45.0
Floor plan payable	(9.4)
Accounts payable	(1.1)
Accrued expenses	(0.2)
Other current liabilities	(0.4)
Deferred tax liability	(3.7)
Total Liabilities	(14.8)
Net Assets Acquired	30.2
Assets acquired net of cash	$ 29.5
ScottTech, Baron, Gibson, Midwest Mine, Ambrose and Ginop
Business Acquisition [Line Items]
Cash							1.8
Accounts receivable							8.5
Inventory							29.3
Prepaid and other assets							0.9
Rental fleet, net							13.1
Property and equipment, net							3.6
Intangible assets							19.9
Goodwill							20.6
Total Assets							97.7
Floor plan payable							(17.1)
Accounts payable							(5.1)
Accrued expenses							(2.7)
Other current liabilities							(2.7)
Deferred tax liability							(3.7)
Other liabilities							(0.7)
Total Liabilities							(32.0)
Net Assets Acquired							65.7
Assets acquired net of cash							$ 63.9