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Debt - Summary of Debt (Parenthetical) (Details) - USD ($) $ in Millions		9 Months Ended	12 Months Ended
	Sep. 21, 2021	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Unamortized debt issuance costs		$ 1.4
Revolving Credit Facility, due August 2021 | Line Of Credit
Debt Instrument [Line Items]
Credit facility, expiration date		Jun. 30, 2021	Jun. 30, 2021
Debt instrument, maturity date		Aug. 21, 2021	Aug. 21, 2021
Revolving Credit Facility, due June 2026 | Line Of Credit
Debt Instrument [Line Items]
Credit facility, expiration date		Jun. 30, 2026	Jun. 30, 2026
4.50% Senior Notes, due November 2023 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate		4.50%	4.50%
Senior notes, discount		$ 0.5	$ 0.6
Debt instrument, maturity date		Nov. 01, 2023	Nov. 01, 2023
3.65% Senior Notes, due September 2024 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate		3.65%	3.65%
Senior notes, discount		$ 0.4	$ 0.5
Debt instrument, maturity date		Sep. 15, 2024	Sep. 15, 2024
3.40% Senior Notes, due December 2027 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate		3.40%	3.40%
Senior notes, discount		$ 1.1	$ 1.2
Debt instrument, maturity date		Dec. 15, 2027	Dec. 15, 2027
3.00% Senior Notes, due December 2029 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate		3.00%	3.00%
Senior notes, discount		$ 0.5	$ 0.6
Debt instrument, maturity date		Dec. 15, 2029	Dec. 15, 2029
4.05% Senior Notes, due December 2049 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate		4.05%	4.05%
Senior notes, discount		$ 3.4	$ 3.4
Debt instrument, maturity date		Dec. 15, 2049	Dec. 15, 2049
3.05% Senior Notes, due October 2051 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate	3.05%	3.05%
Senior notes, discount		$ 3.7
Debt instrument, maturity date	Oct. 31, 2051	Oct. 31, 2051

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format.

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Amount, after accumulated amortization, of debt discount.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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