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Goodwill and Other Intangible Assets (Details 1) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Intangible assets subject to amortization:    
Intangible assets, Gross Carrying Amount $ 729.6 $ 575.8
Intangible assets, Accumulated Amortization 363.2 332.9
Intangible assets, Net Carrying Amount 366.4 242.9
Intangible assets not subject to amortization:    
Indefinite Lived Intangible Assets Net 62.5 28.1
Total intangible assets, Gross Carrying Amount 792.1 603.9
Total intangible assets, Net Carrying Amount 428.9 271.0
Customer Relationships [Member]    
Intangible assets subject to amortization:    
Intangible assets, Gross Carrying Amount 322.4 211.4
Intangible assets, Accumulated Amortization 97.6 84.4
Intangible assets, Net Carrying Amount 224.8 127.0
Technology-Based Intangible Assets [Member]    
Intangible assets subject to amortization:    
Intangible assets, Gross Carrying Amount 126.4 95.2
Intangible assets, Accumulated Amortization 29.9 25.4
Intangible assets, Net Carrying Amount 96.5 69.8
Trademarks [Member]    
Intangible assets subject to amortization:    
Intangible assets, Gross Carrying Amount 8.6 6.5
Intangible assets, Accumulated Amortization 4.2 3.8
Intangible assets, Net Carrying Amount 4.4 2.7
Computer Software, Intangible Asset [Member]    
Intangible assets subject to amortization:    
Intangible assets, Gross Carrying Amount 260.0 251.7
Intangible assets, Accumulated Amortization 223.4 211.8
Intangible assets, Net Carrying Amount 36.6 39.9
Unclassified Indefinite-lived Intangible Assets [Member]    
Intangible assets subject to amortization:    
Intangible assets, Gross Carrying Amount 12.2 11.0
Intangible assets, Accumulated Amortization 8.1 7.5
Intangible assets, Net Carrying Amount 4.1 3.5
Trade name [Member]    
Intangible assets not subject to amortization:    
Trade name 53.8 19.4
Air Transportation Equipment [Member]    
Intangible assets not subject to amortization:    
FAA air agency certificates $ 8.7 $ 8.7