Commitments and Contingencies (Details) $ in Millions					3 Months Ended
	Mar. 30, 2018 USD ($)	Feb. 13, 2018 claim	Aug. 07, 2017 USD ($)	Feb. 14, 2017 patent	Mar. 31, 2018 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)
License Fee Dispute
Other Commitments [Line Items]
Additional license fees					$ 4.2
Interest on penalties					$ 17.8
Realtime Data LLC | Patent 728
Other Commitments [Line Items]
Pending claims validity challenged | claim		1
Hughes Network Systems | Elbit
Other Commitments [Line Items]
Damages awarded			$ 21.1
Attorney's fees sought value	$ 13.9
Accrual recorded						$ 33.7
Loss contingency accrual							$ 3.2
Hughes Network Systems | License Fee Dispute
Other Commitments [Line Items]
Loss contingency accrual						22.0	1.3
Hughes Network Systems | Realtime Data LLC
Other Commitments [Line Items]
Patents allegedly infringed | patent				4
Jury Verdict | Hughes Network Systems | Elbit
Other Commitments [Line Items]
Accrual recorded						21.1
Pre and Post Judgment Interest Costs | Hughes Network Systems | Elbit
Other Commitments [Line Items]
Accrual recorded						12.6
Satellite-related obligations
Other Commitments [Line Items]
Satellite-related obligations						$ 439.1	$ 529.9