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Business combination - Revenue and Earnings (Details) - DigitalGlobe - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2017
Business combination    
Revenue $ 221.6  
Net earnings $ 7.6  
Consolidated revenue   $ 2,307.9
Consolidated net earnings   $ 41.7