Goodwill and Other Intangible Assets - Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Intangible assets subject to amortization:
Intangible assets, gross carrying amount	$ 1,087.8	$ 1,104.7
Intangible assets, accumulated amortization	(550.4)	(501.0)
Intangible assets, net carrying amount	537.4	603.7
Intangible assets not subject to amortization:
Intangible assets not subject to amortization	131.4	137.7
Gross intangible assets (excluding goodwill)	1,219.2	1,242.4
Intangible assets, accumulated amortization	(550.4)	(501.0)
Total intangible assets, net carrying amount	668.8	741.4
Trade names
Intangible assets not subject to amortization:
Intangible assets not subject to amortization	122.7	129.0
FAA air agency certificates
Intangible assets not subject to amortization:
Intangible assets not subject to amortization	8.7	8.7
Customer relationships
Intangible assets subject to amortization:
Intangible assets, gross carrying amount	518.1	532.2
Intangible assets, accumulated amortization	(189.3)	(161.9)
Intangible assets, net carrying amount	328.8	370.3
Intangible assets not subject to amortization:
Intangible assets, accumulated amortization	(189.3)	(161.9)
Technology and know-how
Intangible assets subject to amortization:
Intangible assets, gross carrying amount	270.7	277.2
Intangible assets, accumulated amortization	(86.6)	(72.0)
Intangible assets, net carrying amount	184.1	205.2
Intangible assets not subject to amortization:
Intangible assets, accumulated amortization	(86.6)	(72.0)
Trade names
Intangible assets subject to amortization:
Intangible assets, gross carrying amount	14.3	14.2
Intangible assets, accumulated amortization	(9.6)	(8.8)
Intangible assets, net carrying amount	4.7	5.4
Intangible assets not subject to amortization:
Intangible assets, accumulated amortization	(9.6)	(8.8)
Capitalized Software
Intangible assets subject to amortization:
Intangible assets, gross carrying amount	280.0	276.4
Intangible assets, accumulated amortization	(261.3)	(254.6)
Intangible assets, net carrying amount	18.7	21.8
Intangible assets not subject to amortization:
Intangible assets, accumulated amortization	(261.3)	(254.6)
Other
Intangible assets subject to amortization:
Intangible assets, gross carrying amount	4.7	4.7
Intangible assets, accumulated amortization	(3.6)	(3.7)
Intangible assets, net carrying amount	1.1	1.0
Intangible assets not subject to amortization:
Intangible assets, accumulated amortization	$ (3.6)	$ (3.7)