Goodwill and Other Intangible Assets (Details 1) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Intangible assets subject to amortization:
Intangible assets, Gross Carrying Amount	$ 1,039.2	$ 733.7
Intangible assets, Accumulated Amortization	402.9	373.8
Intangible assets, Net Carrying Amount	636.3	359.9
Intangible assets not subject to amortization:
Trade name	98.1	52.0
FAA air agency certificates	8.7	8.7
Indefinite Lived Intangible Assets Net	106.8	60.7
Total intangible assets, Gross Carrying Amount	1,146.0	794.4
Total intangible assets, Net Carrying Amount	743.1	420.6
Customer Relationships [Member]
Intangible assets subject to amortization:
Intangible assets, Gross Carrying Amount	503.3	324.6
Intangible assets, Accumulated Amortization	119.1	103.0
Intangible assets, Net Carrying Amount	384.2	221.6
Technology-Based Intangible Assets [Member]
Intangible assets subject to amortization:
Intangible assets, Gross Carrying Amount	254.0	128.7
Intangible assets, Accumulated Amortization	39.3	33.8
Intangible assets, Net Carrying Amount	214.7	94.9
Trademarks [Member]
Intangible assets subject to amortization:
Intangible assets, Gross Carrying Amount	9.5	8.6
Intangible assets, Accumulated Amortization	4.7	4.3
Intangible assets, Net Carrying Amount	4.8	4.3
Computer Software, Intangible Asset [Member]
Intangible assets subject to amortization:
Intangible assets, Gross Carrying Amount	262.8	261.5
Intangible assets, Accumulated Amortization	233.9	226.5
Intangible assets, Net Carrying Amount	28.9	35.0
Unclassified Indefinite-lived Intangible Assets [Member]
Intangible assets subject to amortization:
Intangible assets, Gross Carrying Amount	9.6	10.3
Intangible assets, Accumulated Amortization	5.9	6.2
Intangible assets, Net Carrying Amount	$ 3.7	$ 4.1