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Fair Value - Summary of Components of Fair Value Measurements of Financial Assets and Liabilities (Details) - USD ($)
$ in Millions
Sep. 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 $ 3.0 $ 6.2
Total assets 188.6 204.1
Liabilities:    
Derivative liabilities 2.2 3.5
Total liabilities 59.0 55.9
Fair Value, Measurements, Recurring | Diversified investments associated with the ESU program    
Cash equivalents:    
Diversified investments associated with the ESU Program 55.2 50.4
Fair Value, Measurements, Recurring | Liabilities associated with the ESUP    
Liabilities:    
Liabilities associated with the ESU Program 56.8 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 130.4 147.5
Fair Value, Measurements, Recurring | Level 1    
Cash equivalents:    
Derivative assets 0.0 0.0
Total assets 55.2 50.4
Liabilities:    
Derivative liabilities 0.0 0.0
Total liabilities 56.8 52.4
Fair Value, Measurements, Recurring | Level 1 | Diversified investments associated with the ESU program    
Cash equivalents:    
Diversified investments associated with the ESU Program 55.2 50.4
Fair Value, Measurements, Recurring | Level 1 | Liabilities associated with the ESUP    
Liabilities:    
Liabilities associated with the ESU Program 56.8 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 3.0 6.2
Total assets 133.4 153.7
Liabilities:    
Derivative liabilities 2.2 3.5
Total liabilities 2.2 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 130.4 147.5
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