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Debt - Narrative (Details) - USD ($) $ in Millions		9 Months Ended
	Apr. 06, 2021	Sep. 30, 2023	Sep. 30, 2022	Aug. 23, 2023	Dec. 31, 2022	Jan. 02, 2020	Nov. 01, 2018
Debt Instrument [Line Items]
Unamortized debt issuance costs		$ 4.6			$ 5.3
Debt issuance costs		2.0	$ 0.0
Term loan
Debt Instrument [Line Items]
Term loan		0.0			136.8	$ 150.0
Senior notes
Debt Instrument [Line Items]
Estimated fair value		350.5
Debt issuance costs	$ 6.6
Senior notes | Unsecured Debt
Debt Instrument [Line Items]
Term loan	$ 400.0	400.0			400.0
Interest rate	4.375%
Revolving Credit Facility | Revolving credit facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity				$ 600.0		$ 500.0	$ 400.0
Revolving credit facility		100.0			$ 0.0
Line of credit facility, remaining borrowing capacity		$ 478.0
Line of credit facility, unused commitment fee percent		0.25%
Unamortized debt issuance costs		$ 2.5
Revolving Credit Facility | Revolving credit facility | Minimum
Debt Instrument [Line Items]
SOFR variable rate spread		1.25%
Line of credit facility, unused commitment fee percent		0.20%
Revolving Credit Facility | Revolving credit facility | Maximum
Debt Instrument [Line Items]
SOFR variable rate spread		2.00%
Line of credit facility, unused commitment fee percent		0.35%
Letter of Credit | Revolving credit facility
Debt Instrument [Line Items]
Letters of credit outstanding, amount		$ 22.0
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Revolving Credit Facility | Revolving credit facility
Debt Instrument [Line Items]
SOFR variable rate spread		1.50%
Designated as Hedging Instrument | Interest Rate Swap
Debt Instrument [Line Items]
Derivative, notional amount		$ 100.0
Derivative, fixed interest rate		2.71%
Derivative asset		$ 0.5

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 45
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481573/470-10-45-13

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 45
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481573/470-10-45-14

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- Definition

The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-15

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- Definition

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.

+ References

No definition available.

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