FAIR VALUE - Summary of Components of Fair Value Measurements of Financial Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
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 | Total
Cash equivalents:
Derivative assets	$ 2.8	$ 2.9
Total assets	164.3	174.7
Liabilities:
Derivative liabilities	6.9	5.9
Total liabilities	54.8	49.9
Fair Value, Measurements, Recurring | Total | Diversified investments associated with the ESU program
Cash equivalents:
Diversified investments associated with the ESU program	46.5	42.8
Fair Value, Measurements, Recurring | Total | Liabilities associated with the ESUP
Liabilities:
Liabilities associated with the ESU program	47.9	44.0
Fair Value, Measurements, Recurring | Total | Bank time deposits with original maturities of three months or less
Cash equivalents:
Bank time deposits with original maturities of three months or less	115.0	129.0
Fair Value, Measurements, Recurring | Level 1
Cash equivalents:
Derivative assets	0.0	0.0
Total assets	46.5	42.8
Liabilities:
Derivative liabilities	0.0	0.0
Total liabilities	47.9	44.0
Fair Value, Measurements, Recurring | Level 1 | Diversified investments associated with the ESU program
Cash equivalents:
Diversified investments associated with the ESU program	46.5	42.8
Fair Value, Measurements, Recurring | Level 1 | Liabilities associated with the ESUP
Liabilities:
Liabilities associated with the ESU program	47.9	44.0
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	2.8	2.9
Total assets	117.8	131.9
Liabilities:
Derivative liabilities	6.9	5.9
Total liabilities	6.9	5.9
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	115.0	129.0
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