Goodwill (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Impairment loss as a result of goodwill	$ 0	$ 0	$ 0
Goodwill [Roll Forward]
Balance at the beginning of the period	585,500,000	431,700,000
Goodwill acquired		154,100,000
Purchase price adjustments	300,000
Foreign currency translation	200,000	(300,000)
Balance at the end of the period	586,000,000.0	585,500,000	431,700,000
Commercial
Goodwill [Roll Forward]
Balance at the beginning of the period	368,700,000	369,000,000.0
Goodwill acquired		0
Purchase price adjustments	0
Foreign currency translation	200,000	(300,000)
Balance at the end of the period	368,900,000	368,700,000	369,000,000.0
Aviation
Goodwill [Roll Forward]
Balance at the beginning of the period	216,800,000	62,700,000
Goodwill acquired		154,100,000
Purchase price adjustments	300,000
Foreign currency translation	0	0
Balance at the end of the period	$ 217,100,000	$ 216,800,000	$ 62,700,000