Investments in Unconsolidated Affiliates (Tables)

12 Months Ended

Dec. 31, 2023

Equity Method Investments and Joint Ventures [Abstract]

Summary of Investments in Unconsolidated Affiliates Accounted for Under Equity Method

Investments in unconsolidated affiliates accounted for under the equity method consisted of the following (in millions):

				December 31,
	Ownership %			2023		2022
Robotic Research LLC		1	%	$	11.2	$	11.2
AutoTech Fund II, L.P.		7	%		8.5		8.7
Carnegie Foundry LLC		6	%		4.7		4.8
Westly Capital Partners Fund IV, L.P.		3	%		3.8		2.8
BME Fire Trucks LLC		25	%		2.8		3.9
Construction Robotics, LLC		9	%		2.3		2.4
AutoTech Fund III, L.P.		6	%		1.2		0.8
Mezcladores Trailers de Mexico, S.A. de C.V.		—			—		8.3
				$	34.5	$	42.9

Summary of Investments in Unconsolidated Affiliates Not Accounted for Under Equity Method Without a Readily Determinable Fair Value

Investments in unconsolidated affiliates not accounted for under the equity method with a readily determinable fair value consisted of the following (in millions):

	Cost Basis		Unrealized Gain (Loss)			Fair Value
December 31, 2023	$	25.0	$	(21.5	)	$	3.5
December 31, 2022	$	25.0	$	(21.2	)	$	3.8

Investments in unconsolidated affiliates not accounted for under the equity method without a readily determinable fair value consisted of the following (in millions):

	Cost Basis		Accumulated Impairment and Adjustments			Carrying Value
December 31, 2023	$	5.5	$	(0.2	)	$	5.3
December 31, 2022	$	4.2	$	(0.2	)	$	4.0