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Financial instruments and fair value disclosures - Fair value of financial instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Financial instruments and fair value disclosures    
Financial liabilities carrying amount $ 3,327.4 $ 958.7
Financial assets pledged as collateral 3,786.0 1,578.1
Orbital receivables    
Financial instruments and fair value disclosures    
Financial assets at fair value 507.0 505.0
Financial assets carrying amount 454.2 445.6
Long-term debt | Financial instruments carried at amortized cost    
Financial instruments and fair value disclosures    
Financial liabilities carrying amount 2,942.2 596.0
Long-term debt | Financial instruments carried at amortized cost | Level 2    
Financial instruments and fair value disclosures    
Financial liabilities at fair value 3,176.3 598.7
Long-term debt | Financial instruments carried at amortized cost | Net investment hedge    
Financial instruments and fair value disclosures    
Financial liabilities carrying amount 271.0  
Financial assets carrying amount   50.0
Long-term debt | Financial instruments carried at amortized cost | Net investment hedge | Level 2    
Financial instruments and fair value disclosures    
Financial liabilities at fair value $ 297.8 $ 50.2