Goodwill (Tables)

12 Months Ended

Dec. 31, 2021

Goodwill And Intangible Assets Disclosure [Abstract]

Schedule of Changes in Carrying Amounts of Goodwill

The changes in the carrying amounts of goodwill for the years ended December 31, 2021 and 2020 were as follows:

(millions)	Commercial		Aviation			Total
Net book values as of January 1, 2020
Goodwill	$	377.0	$	209.0		$	586.0
Accumulated impairment losses		—		—			—
Total	$	377.0	$	209.0		$	586.0
Impairment		—		(59.5	)		(59.5	)
Foreign currency translation	$	0.1	$	—		$	0.1
Net book value as of December 31, 2020
Goodwill	$	377.1	$	209.0		$	586.1
Accumulated impairment losses		—		(59.5	)		(59.5	)
Total	$	377.1	$	149.5		$	526.6
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