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STOCK-BASED COMPENSATION - Summary of Components of Stock-Based and Stock-Related Compensation (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation |  |  | $ 21.7 | $ 25.0
Tax benefits on stock-based compensation expense | $ 0.6 | $ 0.4 | 3.9 | 4.7
To be settled with stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-related compensation expense | 2.4 | 1.6 | 14.9 | 16.8
Employee contributions for above stock plans | 2.8 | 2.7 | 6.8 | 8.2
Total stock-based compensation | 5.2 | 4.3 | 21.7 | 25.0
Tax benefits on stock-based compensation expense | 0.6 | 0.4 | 3.6 | 4.1
To be settled with stock | Tax benefits on stock-based compensation payments |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Tax benefits on stock-based compensation expense | 0.0 | 0.0 | 0.3 | 0.6
To be settled with stock | Executive Stock Unit (ESU) program contributions |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-related compensation expense | 0.1 | 0.4 | 1.9 | 2.6
To be settled with stock | Deferred Stock Compensation Program |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-related compensation expense | 0.3 | 0.4 | 1.1 | 1.2
To be settled with stock | ESU program |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-related compensation expense | 0.2 | 0.3 | 0.8 | 1.0
To be settled with stock | Discount Stock Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-related compensation expense | 0.2 | 0.2 | 0.6 | 0.6
To be settled with stock | 2023 PSU awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-related compensation expense | 0.4 | 0.0 | 1.0 | 0.0
To be settled with stock | 2022 and prior PSU awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-related compensation expense | (0.1) | (1.0) | 1.2 | 1.5
To be settled with stock | Restricted Stock Unit (RSU) awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-related compensation expense | 0.9 | 0.9 | 7.0 | 8.5
To be settled with stock | Other, primarily non-employee directors restricted stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-related compensation expense | 0.4 | 0.4 | 1.3 | 1.4
To be settled in cash |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-related compensation expense | (0.1) | (1.0) | 1.0 | 0.2
To be settled in cash | Executive Stock Unit (ESU) program contributions |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-related compensation expense | 0.2 | 0.2 | 0.5 | 0.6
To be settled in cash | Deferred Stock Compensation Program |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-related compensation expense | 0.0 | 0.0 | 0.0 | 0.0
To be settled in cash | ESU program |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-related compensation expense | 0.0 | 0.0 | 0.0 | 0.0
To be settled in cash | Discount Stock Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-related compensation expense | 0.0 | 0.0 | 0.0 | 0.0
To be settled in cash | 2023 PSU awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-related compensation expense | 0.2 | 0.0 | 0.8 | 0.0
To be settled in cash | 2022 and prior PSU awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-related compensation expense | (0.5) | (1.2) | (0.3) | (0.4)
To be settled in cash | Restricted Stock Unit (RSU) awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-related compensation expense | 0.0 | 0.0 | 0.0 | 0.0
To be settled in cash | Other, primarily non-employee directors restricted stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-related compensation expense | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0

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