Goodwill (Tables)

9 Months Ended

Sep. 30, 2020

Goodwill And Intangible Assets Disclosure [Abstract]

Schedule of Amounts for Goodwill and Changes to Carrying Value by Operating Segment

The changes to the carrying amount of goodwill for the nine months ended September 30, 2020 were as follows:

(millions) (unaudited)	Commercial			Aviation			Total
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 September 30, 2020
Goodwill	$	376.9		$	209.0		$	585.9
Accumulated impairment losses		—			(59.5	)		(59.5	)
Total	$	376.9		$	149.5		$	526.4