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Goodwill and Other Intangible Assets (Details 1) - USD ($)
$ in Millions
Sep. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Intangible assets subject to amortization:      
Intangible assets, Gross Carrying Amount $ 1,048.2   $ 1,045.0
Intangible assets, Accumulated Amortization 457.7   416.7
Intangible assets, Net Carrying Amount 590.5   628.3
Intangible assets not subject to amortization:      
Trade name 103.6   96.2
FAA air agency certificates 8.7   8.7
Indefinite Lived Intangible Assets Net 112.3   104.9
Total intangible assets, Gross Carrying Amount 1,160.5   1,149.9
Total intangible assets, Net Carrying Amount 702.8 $ 733.9 733.2
Customer Relationships [Member]      
Intangible assets subject to amortization:      
Intangible assets, Gross Carrying Amount 481.7   481.5
Intangible assets, Accumulated Amortization 120.6   99.8
Intangible assets, Net Carrying Amount 361.1   381.7
Technology-Based Intangible Assets [Member]      
Intangible assets subject to amortization:      
Intangible assets, Gross Carrying Amount 244.9   245.0
Intangible assets, Accumulated Amortization 50.7   40.4
Intangible assets, Net Carrying Amount 194.2   204.6
Trademarks [Member]      
Intangible assets subject to amortization:      
Intangible assets, Gross Carrying Amount 11.9   11.3
Intangible assets, Accumulated Amortization 5.6   4.8
Intangible assets, Net Carrying Amount 6.3   6.5
Computer Software, Intangible Asset [Member]      
Intangible assets subject to amortization:      
Intangible assets, Gross Carrying Amount 268.6   266.4
Intangible assets, Accumulated Amortization 243.6   236.5
Intangible assets, Net Carrying Amount 25.0   29.9
Unclassified Indefinite-lived Intangible Assets [Member]      
Intangible assets subject to amortization:      
Intangible assets, Gross Carrying Amount 41.1   40.8
Intangible assets, Accumulated Amortization 37.2   35.2
Intangible assets, Net Carrying Amount $ 3.9   $ 5.6