Goodwill (Tables)

12 Months Ended

Dec. 31, 2020

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, 2020 and 2019 were as follows:

(millions)	Commercial		Aviation			Total
Net book values as of January 1, 2019
Goodwill	$	376.8	$	208.7		$	585.5
Accumulated impairment losses		—		—			—
Total	$	376.8	$	208.7		$	585.5
Purchase price adjustments		—		0.3			0.3
Foreign currency translation		0.2		—			0.2
Net book value as of December 31, 2019
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