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Orbital receivables (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2016
Orbital receivables      
Orbital receivables $ 454.2 $ 445.5  
Current portion (30.0) (27.1)  
Non-current portion 424.2 $ 418.4 $ 409.7
Total contractual cash flows 788.4    
Less than one year/2018      
Orbital receivables      
Orbital receivables 30.0    
Total contractual cash flows 57.8    
1-2 Years/2019      
Orbital receivables      
Orbital receivables 29.4    
Total contractual cash flows 60.2    
2-3 Years/2020      
Orbital receivables      
Orbital receivables 37.4    
Total contractual cash flows 65.8    
3-4 Years/2021      
Orbital receivables      
Orbital receivables 42.5    
Total contractual cash flows 66.6    
4-5 Years/2022      
Orbital receivables      
Orbital receivables 47.7    
Total contractual cash flows 71.3    
More than five years      
Orbital receivables      
Orbital receivables 267.2    
Total contractual cash flows $ 466.7    
Orbital receivables | Minimum      
Orbital receivables      
Present value discount rate of receivable (in percent) 6.00% 6.00%  
Orbital receivables | Maximum      
Orbital receivables      
Present value discount rate of receivable (in percent) 10.00% 10.00%  
Launched      
Orbital receivables      
Orbital receivables $ 394.6 $ 367.9  
Current portion (30.0) (27.1)  
Non-current portion 364.6 340.8  
Launched | Less than one year/2018      
Orbital receivables      
Orbital receivables 30.0    
Launched | 1-2 Years/2019      
Orbital receivables      
Orbital receivables 29.1    
Launched | 2-3 Years/2020      
Orbital receivables      
Orbital receivables 35.7    
Launched | 3-4 Years/2021      
Orbital receivables      
Orbital receivables 38.8    
Launched | 4-5 Years/2022      
Orbital receivables      
Orbital receivables 41.8    
Launched | More than five years      
Orbital receivables      
Orbital receivables 219.2    
Unlaunched      
Orbital receivables      
Orbital receivables 59.6 77.6  
Non-current portion 59.6 $ 77.6  
Unlaunched | 1-2 Years/2019      
Orbital receivables      
Orbital receivables 0.3    
Unlaunched | 2-3 Years/2020      
Orbital receivables      
Orbital receivables 1.7    
Unlaunched | 3-4 Years/2021      
Orbital receivables      
Orbital receivables 3.7    
Unlaunched | 4-5 Years/2022      
Orbital receivables      
Orbital receivables 5.9    
Unlaunched | More than five years      
Orbital receivables      
Orbital receivables $ 48.0