Goodwill

9 Months Ended

Sep. 30, 2022

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill

7. Goodwill

The changes in the carrying amount of goodwill during the nine months ended September 30, 2022 (unaudited) were as follows:

(millions)	Commercial			Aviation			Total
Net book value as of December 31, 2021
Goodwill	$	377.1		$	209.0		$	586.1
Accumulated impairment losses		—			(59.5	)		(59.5	)
Total	$	377.1		$	149.5		$	526.6
Foreign currency translation		(0.3	)		—			(0.3	)
Net book value as of September 30, 2022
Goodwill	$	376.8		$	209.0		$	585.8
Accumulated impairment losses		—			(59.5	)		(59.5	)
Total	$	376.8		$	149.5		$	526.3