Quarterly report pursuant to Section 13 or 15(d)

Equity Method Investments (Details)

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Equity Method Investments (Details) - USD ($)
$ in Millions
3 Months Ended
Jul. 27, 2016
Dec. 31, 2017
Mar. 31, 2018
Schedule of Equity Method Investments [Line Items]      
Difference between carrying amount and underlying equity     $ 116.4
Finite lived intangible asset, weighted average useful life 14 years 11 months    
Wireless Maritime Services      
Schedule of Equity Method Investments [Line Items]      
Equity Method Investment, Other than Temporary Impairment   $ 16.7  
Ownership percentage 49.00%    
Santander      
Schedule of Equity Method Investments [Line Items]      
Ownership percentage 49.00%