Goodwill and Other Intangible Assets (Details 1) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Intangible assets subject to amortization:
Intangible assets, Gross Carrying Amount	$ 1,090.7	$ 1,072.8
Intangible assets, Accumulated Amortization	(487.5)	(444.5)
Intangible assets, Net Carrying Amount	603.2	628.3
Intangible assets not subject to amortization:
Trade name	125.3	121.5
FAA air agency certificates	8.7	8.7
Indefinite Lived Intangible Assets Net	134.0	130.2
Total intangible assets, Gross Carrying Amount	1,224.7	1,203.0
Total intangible assets, Net Carrying Amount	737.2	758.5
Customer Relationships [Member]
Intangible assets subject to amortization:
Intangible assets, Gross Carrying Amount	519.8	510.9
Intangible assets, Accumulated Amortization	(152.3)	(128.8)
Intangible assets, Net Carrying Amount	367.5	382.1
Technology-Based Intangible Assets [Member]
Intangible assets subject to amortization:
Intangible assets, Gross Carrying Amount	270.2	265.1
Intangible assets, Accumulated Amortization	(66.7)	(54.7)
Intangible assets, Net Carrying Amount	203.5	210.4
Trademarks [Member]
Intangible assets subject to amortization:
Intangible assets, Gross Carrying Amount	12.7	12.7
Intangible assets, Accumulated Amortization	(6.7)	(6.1)
Intangible assets, Net Carrying Amount	6.0	6.6
Computer Software, Intangible Asset [Member]
Intangible assets subject to amortization:
Intangible assets, Gross Carrying Amount	274.0	270.3
Intangible assets, Accumulated Amortization	(252.0)	(245.8)
Intangible assets, Net Carrying Amount	22.0	24.5
Unclassified Indefinite-lived Intangible Assets [Member]
Intangible assets subject to amortization:
Intangible assets, Gross Carrying Amount	14.0	13.8
Intangible assets, Accumulated Amortization	(9.8)	(9.1)
Intangible assets, Net Carrying Amount	$ 4.2	$ 4.7