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Trade and other receivables (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2016
Trade and other receivables      
Trade accounts receivable, net $ 273.1 $ 175.9  
Orbital receivables, current portion 30.0 27.1  
Other 45.1 28.1  
Trade and other receivables, Total $ 348.2 $ 231.1 $ 273.9