Goodwill

6 Months Ended

Jun. 30, 2022

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill

7. Goodwill

There were no changes in the carrying amount of goodwill during the six months ended June 30, 2022 (unaudited). The balances for each segment were as follows:

(millions)	Commercial		Aviation			Total
Net book value as of June 30, 2022 and December 31, 2021
Goodwill	$	377.1	$	209.0		$	586.1
Accumulated impairment losses		—		(59.5	)		(59.5	)
Total	$	377.1	$	149.5		$	526.6