Goodwill (Tables)

9 Months Ended

Sep. 30, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Changes in Carrying Amounts of Goodwill

The changes in the carrying amount of goodwill during the nine months ended September 30, 2023 (unaudited) were as follows:

(millions)	Commercial		Aviation			Total
Net book value as of December 31, 2022
Goodwill	$	387.0	$	215.7		$	602.7
Accumulated impairment losses		—		(59.5	)		(59.5	)
Total	$	387.0	$	156.2		$	543.2
Acquisition		0.9		—			0.9
Foreign currency translation		—		0.1			0.1
Net book value as of September 30, 2023
Goodwill	$	387.9	$	215.8		$	603.7
Accumulated impairment losses		—		(59.5	)		(59.5	)
Total	$	387.9	$	156.3		$	544.2