Fair Value Measurement (Tables)

12 Months Ended

Dec. 31, 2021

Schedule of Measurement Date, Net Book Value and Related Impairment Charges for Assets

For those assets and asset groups for which impairment was recorded, the fair value as of the measurement date, net book value as of December 31, 2021 and related impairment charges during the years ended December 31, 2021 and 2020, were as follows:

	Year ended December 31, 2021					As of December 31, 2021
		As of Measurement Date
(millions)	Measurement Date	Impairment Charge		Fair Value Measurement (Level 3)		Net Book Value of Assets Assessed for Impairment
ROU assets	March 31, 2021	$	0.1	$	—
ROU assets	September 30, 2021		3.5		2.0
Total of ROU assets impaired		$	3.6	$	2.0	$	1.9

	Year ended December 31, 2020					As of December 31, 2020
		As of Measurement Date
(millions)	Measurement Date	Impairment Charge		Fair Value Measurement (Level 3)		Net Book Value of Assets Assessed for Impairment
ROU assets	March 31, 2020	$	77.5	$	147.4
ROU assets	June 30, 2020		16.7		26.2
ROU assets	September 30, 2020		1.6		1.6
ROU assets	December 31, 2020		2.9		5.0
Total of ROU assets impaired			98.7		180.2		121.4
Goodwill - Aviation reporting unit	August 31, 2020		59.5		149.5		149.5
Proprietary know how	June 30, 2020		3.7		3.9
Customer relationships	August 31, 2020		69.2		4.6
Trade names and trademarks	August 31, 2020		2.9		0.5
Total Other intangible assets, net			75.8		9.0		8.3