Investments in Affiliates and Other Entities (Details) mile in Thousands, $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended	12 Months Ended
	Mar. 31, 2022 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2020 mile	Dec. 31, 2021 USD ($)	Oct. 31, 2021	Mar. 31, 2021 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Equity method investments		$ 120.6		$ 120.6		$ 101.2
Length of electric transmission and distribution system | mile					18
Equity security fair value		41.5		41.5
Investment balance		28.6		28.6		130.2
Decrease in fair value		(41.7)		(50.0)
Investment in real estate		24.3		24.3				$ 23.5
LUMA Energy, LLC
Summary Of Significant Accounting Policies [Line Items]
Term of operation and maintenance agreement					15 years
Integral Affiliates
Summary Of Significant Accounting Policies [Line Items]
Equity method investments		70.5		70.5		67.8
Due from related parties		59.3		59.3		49.0
Due to related parties		12.9		12.9		56.3
Revenue from related parties		26.4		51.5
Related party cost of sales		21.9		72.3
LUMA Energy, LLC
Summary Of Significant Accounting Policies [Line Items]
Equity method investments		$ 31.1		$ 31.1		30.6
Equity interest		50.00%		50.00%
Integral Affiliate Offering Right-of-way Solutions
Summary Of Significant Accounting Policies [Line Items]
Equity method investments		$ 26.8		$ 26.8		28.5
Equity interest							44.00%
Non-Integral Unconsolidated Affiliates
Summary Of Significant Accounting Policies [Line Items]
Equity method investments		$ 50.1		$ 50.1		$ 33.4
Broadband Technology Provider
Summary Of Significant Accounting Policies [Line Items]
Cost method investments								$ 90.0
Starry Group Holdings, Inc.
Summary Of Significant Accounting Policies [Line Items]
Payments to acquire equity securities	$ 1.5
Technology Incubation Company
Summary Of Significant Accounting Policies [Line Items]
Cost method investments, gain on sale			$ 6.7
Cost method investments, gain on sale, after tax			$ 5.0