Goodwill (Tables)

12 Months Ended

Dec. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of amounts for goodwill and changes to carrying value by operating segment

The amounts for goodwill and changes to carrying value by reportable segment are as follows:

(millions)	Commercial			Aviation		Total
Balance as of December 31, 2017	$	369.0		$	62.7	$	431.7
Goodwill acquired	—			154.1		154.1
Foreign currency translation	(0.3		)	—		(0.3		)
Balance as of December 31, 2018	$	368.7		$	216.8	$	585.5
Purchase price adjustments	—			0.3		0.3
Foreign currency translation	0.2			—		0.2
Balance as of December 31, 2019	$	368.9		$	217.1	$	586.0