Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation (Details)

v3.19.2
Basis of Presentation (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
product
Jun. 30, 2018
USD ($)
Liberty        
Reimbursable amount | $ $ 17.0 $ 0.9 $ 17.9 $ 1.8
Skyhook        
Number of primary products | product     2  
Charter        
Investment control percentage     25.01%