Quarterly report pursuant to Section 13 or 15(d)

Equity Method Investments (Details)

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Equity Method Investments (Details) - USD ($)
$ in Millions
Jul. 27, 2016
Sep. 30, 2017
Schedule of Equity Method Investments [Line Items]    
Difference between carrying amount and underlying equity   $ 136.4
Weighted average useful life 14 years 11 months  
Wireless Maritime Services    
Schedule of Equity Method Investments [Line Items]    
Ownership percentage 49.00%  
Santander    
Schedule of Equity Method Investments [Line Items]    
Ownership percentage 49.00%