FAIR VALUE - Items Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Total
Cash equivalents:
Derivative assets	$ 6.2	$ 5.9
Total assets	201.6	171.3
Liabilities:
Derivative liabilities	1.4	1.2
Total liabilities	48.7	52.1
Total | Diversified investments associated with the (ESUP)
Cash equivalents:
Diversified investments associated with the Executive Stock Unit Program (ESUP)	47.6	51.0
Total | Liabilities associated with the ESUP
Liabilities:
Liabilities associated with the ESUP	47.3	50.9
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	147.8	114.4
Level 1
Cash equivalents:
Derivative assets	0.0	0.0
Total assets	47.6	51.0
Liabilities:
Derivative liabilities	0.0	0.0
Total liabilities	47.3	50.9
Level 1 | Diversified investments associated with the (ESUP)
Cash equivalents:
Diversified investments associated with the Executive Stock Unit Program (ESUP)	47.6	51.0
Level 1 | Liabilities associated with the ESUP
Liabilities:
Liabilities associated with the ESUP	47.3	50.9
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
Level 2
Cash equivalents:
Derivative assets	6.2	5.9
Total assets	154.0	120.3
Liabilities:
Derivative liabilities	1.4	1.2
Total liabilities	1.4	1.2
Level 2 | Diversified investments associated with the (ESUP)
Cash equivalents:
Diversified investments associated with the Executive Stock Unit Program (ESUP)	0.0	0.0
Level 2 | Liabilities associated with the ESUP
Liabilities:
Liabilities associated with the ESUP	0.0	0.0
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	147.8	114.4
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
Level 3 | Diversified investments associated with the (ESUP)
Cash equivalents:
Diversified investments associated with the Executive Stock Unit Program (ESUP)	0.0	0.0
Level 3 | Liabilities associated with the ESUP
Liabilities:
Liabilities associated with the ESUP	0.0	0.0
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