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Related Party Transactions (Details)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
joint_venture
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Related Party Transaction [Line Items]      
Payable to affiliates $ 2.1   $ 3.0
Two microwave communication network JVs      
Related Party Transaction [Line Items]      
Payments to related party $ 5.2 $ 5.6  
Number of microwave communication network JVs the Company makes payments to | joint_venture 2    
Level 3      
Related Party Transaction [Line Items]      
Payments for purchases $ 0.3 0.7  
Dell      
Related Party Transaction [Line Items]      
Payments for purchases 1.1 0.6  
SBI      
Related Party Transaction [Line Items]      
Payments to related party $ 3.4 $ 2.3