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Fair Value - Summary of Components of Fair Value Measurements of Financial Assets and Liabilities (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Cash equivalents: |  |
Derivative asset, statement of financial position [extensible enumeration] | Assets, Current, Sundry | Assets, Current, Sundry
Liabilities: |  |
Derivative liability, statement of financial position [extensible enumeration] | Liabilities, Noncurrent, Other current liabilities | Liabilities, Noncurrent, Other current liabilities
Fair Value, Measurements, Recurring |  |
Cash equivalents: |  |
Derivative assets | $ 3.1 | $ 6.2
Total assets | 209.2 | 204.1
Liabilities: |  |
Derivative liabilities | 3.0 | 3.5
Total liabilities | 57.2 | 55.9
Fair Value, Measurements, Recurring | Diversified investments associated with the ESU program |  |
Cash equivalents: |  |
Diversified investments associated with the ESU Program | 53.6 | 50.4
Fair Value, Measurements, Recurring | Liabilities associated with the ESUP |  |
Liabilities: |  |
Liabilities associated with the ESU Program | 54.2 | 52.4
Fair Value, Measurements, Recurring | Bank time deposits with original maturities of three months or less |  |
Cash equivalents: |  |
Bank time deposits with original maturities of three months or less | 152.5 | 147.5
Fair Value, Measurements, Recurring | Level 1 |  |
Cash equivalents: |  |
Derivative assets | 0.0 | 0.0
Total assets | 53.6 | 50.4
Liabilities: |  |
Derivative liabilities | 0.0 | 0.0
Total liabilities | 54.2 | 52.4
Fair Value, Measurements, Recurring | Level 1 | Diversified investments associated with the ESU program |  |
Cash equivalents: |  |
Diversified investments associated with the ESU Program | 53.6 | 50.4
Fair Value, Measurements, Recurring | Level 1 | Liabilities associated with the ESUP |  |
Liabilities: |  |
Liabilities associated with the ESU Program | 54.2 | 52.4
Fair Value, Measurements, Recurring | Level 1 | Bank time deposits with original maturities of three months or less |  |
Cash equivalents: |  |
Bank time deposits with original maturities of three months or less | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 2 |  |
Cash equivalents: |  |
Derivative assets | 3.1 | 6.2
Total assets | 155.6 | 153.7
Liabilities: |  |
Derivative liabilities | 3.0 | 3.5
Total liabilities | 3.0 | 3.5
Fair Value, Measurements, Recurring | Level 2 | Diversified investments associated with the ESU program |  |
Cash equivalents: |  |
Diversified investments associated with the ESU Program | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 2 | Liabilities associated with the ESUP |  |
Liabilities: |  |
Liabilities associated with the ESU Program | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 2 | Bank time deposits with original maturities of three months or less |  |
Cash equivalents: |  |
Bank time deposits with original maturities of three months or less | 152.5 | 147.5
Fair Value, Measurements, Recurring | Level 3 |  |
Cash equivalents: |  |
Derivative assets | 0.0 | 0.0
Total assets | 0.0 | 0.0
Liabilities: |  |
Derivative liabilities | 0.0 | 0.0
Total liabilities | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 3 | Diversified investments associated with the ESU program |  |
Cash equivalents: |  |
Diversified investments associated with the ESU Program | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 3 | Liabilities associated with the ESUP |  |
Liabilities: |  |
Liabilities associated with the ESU Program | 0.0 | 0.0
Fair Value, Measurements, Recurring | Level 3 | Bank time deposits with original maturities of three months or less |  |
Cash equivalents: |  |
Bank time deposits with original maturities of three months or less | $ 0.0 | $ 0.0

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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