Property and Equipment (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Property and Equipment      
Total property and equipment $ 3,124.1   $ 3,270.2
Accumulated depreciation and amortization (985.8)   (1,095.5)
Property and equipment, net 2,138.3   2,174.7
Depreciation expense 64.7 55.1  
Satellites      
Property and Equipment      
Total property and equipment 1,798.7   1,973.1
Accumulated depreciation and amortization (660.2)   (795.4)
Property and equipment, net 1,138.5   1,177.7
Satellites | Minimum      
Property and Equipment      
Depreciable Life 9 years    
Satellites | Maximum      
Property and Equipment      
Depreciable Life 13 years    
Quickbird Satellite      
Property and Equipment      
Depreciable Life 12 years 2 months 12 days    
Total property and equipment     174.4
Accumulated depreciation and amortization     (174.4)
WorldView-1 Satellite      
Property and Equipment      
Depreciable Life 13 years    
Total property and equipment 473.2   473.2
Accumulated depreciation and amortization (323.4)   (316.8)
Property and equipment, net 149.8   156.4
WorldView-2 Satellite      
Property and Equipment      
Depreciable Life 13 years    
Total property and equipment 463.2   463.2
Accumulated depreciation and amortization (215.8)   (207.9)
Property and equipment, net 247.4   255.3
WorldView-3 Satellite      
Property and Equipment      
Depreciable Life 11 years 6 months    
Total property and equipment 649.5   649.5
Accumulated depreciation and amortization (28.2)   (14.1)
Property and equipment, net 621.3   635.4
IKONOS Satellite      
Property and Equipment      
Depreciable Life 9 years    
Total property and equipment 1.0   1.0
Accumulated depreciation and amortization (1.0)   (1.0)
GeoEye-1 Satellite      
Property and Equipment      
Depreciable Life 9 years    
Total property and equipment 211.8   211.8
Accumulated depreciation and amortization (91.8)   (81.2)
Property and equipment, net 120.0   130.6
Construction in progress      
Property and Equipment      
Total property and equipment 765.8   765.1
Computer equipment and software      
Property and Equipment      
Total property and equipment 403.6   376.2
Computer equipment and software | Minimum      
Property and Equipment      
Depreciable Life 3 years    
Computer equipment and software | Maximum      
Property and Equipment      
Depreciable Life 12 years    
Machinery and equipment, including ground terminals      
Property and Equipment      
Depreciable Life 5 years    
Total property and equipment 109.3   109.3
Furniture, fixtures and other      
Property and Equipment      
Total property and equipment 40.1   39.9
Furniture, fixtures and other | Minimum      
Property and Equipment      
Depreciable Life 3 years    
Furniture, fixtures and other | Maximum      
Property and Equipment      
Depreciable Life 7 years    
Land and buildings      
Property and Equipment      
Depreciable Life 34 years    
Total property and equipment $ 6.6   $ 6.6