Other Intangible Assets, net - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Finite Lived Intangible Assets [Line Items]
Carrying amount	$ 140,700,000		$ 140,700,000		$ 152,200,000
Impairment charge	3,700,000	$ 0	3,700,000	$ 0
Proprietary Know How
Finite Lived Intangible Assets [Line Items]
Carrying amount	3,900,000		3,900,000		$ 8,400,000
Impairment charges		$ 0		$ 0
Proprietary Know How | Aviation
Finite Lived Intangible Assets [Line Items]
Impairment charge	3,700,000		3,700,000
Proprietary Know How | Level 3
Finite Lived Intangible Assets [Line Items]
Carrying amount	7,600,000		7,600,000
Fair value	$ 3,900,000		$ 3,900,000