Commitments and Contingencies - Narrative - Environmental Matters (Details) $ in Millions		3 Months Ended	12 Months Ended
	May 09, 2017	Mar. 31, 2023 USD ($) legalMatter	Dec. 31, 2002 USD ($) a waterCompany respondent	Dec. 31, 2022 USD ($)	Dec. 31, 2008 a	Oct. 31, 2001 USD ($)
Site Contingency [Line Items]
Accrued environmental costs		$ 285.3		$ 290.5
Guarantee obligations		$ 120.0
Number of acres subject to environmental remediation efforts | a					400
Amortization period for environmental remediation costs		15 years
Various environmental matters
Site Contingency [Line Items]
Number of environmental remediation matters (over) | legalMatter		40
Accrued environmental costs		$ 285.3
Environmental obligation funding (as a percent)		98.00%
Various environmental matters | Sacramento, California
Site Contingency [Line Items]
Accrued environmental costs		$ 224.1
Various environmental matters | Sacramento, California | Environmental Protection Agency
Site Contingency [Line Items]
Non-contaminated land | a			2,600
Various environmental matters | Sacramento, California | Previously reported
Site Contingency [Line Items]
Guarantee obligations			$ 20.0
Various environmental matters | Baldwin Park Operable Unit
Site Contingency [Line Items]
Accrued environmental costs		$ 45.2
Guarantee obligations						$ 25.0
Various environmental matters | Baldwin Park Operable Unit | Aerojet Rocketdyne, Inc.
Site Contingency [Line Items]
Percentage of responsibility in all project costs		74.00%
Various environmental matters | Baldwin Park Operable Unit | Environmental Protection Agency
Site Contingency [Line Items]
Number of respondents | respondent			7
Number of water companies | waterCompany			5
Term of arrangement (years)	10 years
Various environmental matters | Minimum
Site Contingency [Line Items]
Estimated environmental costs		$ 285.3
Various environmental matters | Minimum | Sacramento, California
Site Contingency [Line Items]
Estimated environmental costs		224.1
Guarantee obligations			$ 10.0
Various environmental matters | Minimum | Baldwin Park Operable Unit
Site Contingency [Line Items]
Estimated environmental costs		45.2
Various environmental matters | Maximum
Site Contingency [Line Items]
Estimated environmental costs		441.4
Various environmental matters | Maximum | Sacramento, California
Site Contingency [Line Items]
Estimated environmental costs		358.5
Guarantee obligations			$ 75.0
Various environmental matters | Maximum | Baldwin Park Operable Unit
Site Contingency [Line Items]
Estimated environmental costs		$ 55.4