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Related Party Transactions (Details) $ / shares in Units, $ in Millions	1 Months Ended	12 Months Ended
	May 31, 2019 $ / shares shares	Dec. 31, 2019 USD ($) joint_venture	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Related Party Transaction [Line Items]
Payable to affiliates		$ 1.3	$ 3.0
Public Stock Offering \| Class A
Related Party Transaction [Line Items]
Number of shares issued (in shares) \| shares	9,000,000
Price per share (in dollars per share) \| $ / shares	$ 22.00
Temasek Investment \| CSA
Related Party Transaction [Line Items]
Related party costs		0.1
Microwave communication network JVs
Related Party Transaction [Line Items]
Payments to related party		$ 19.9	20.0	$ 8.3
Number of microwave communication network JVs the Company makes payments to \| joint_venture		2
One Joint Venture \| Certain Assets Including Intangible Assets With Leases
Related Party Transaction [Line Items]
Property, Plant and Equipment, Disposals			1.1
Proceeds from disposal of assets			0.6
Level 3
Related Party Transaction [Line Items]
Payments for purchases		$ 1.5	1.5	2.5
SBI
Related Party Transaction [Line Items]
Payments to related party		$ 12.9	$ 9.5	$ 6.0