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PREFERRED STOCK AND COMMON SHAREHOLDERS' EQUITY (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  |  |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 12, 2026 | Feb. 27, 2026 | Jan. 14, 2026 | Dec. 31, 2023 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Jul. 24, 2024 | Dec. 31, 2022 | Dec. 31, 2021
Stockholders' Equity Note [Abstract] |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  |  | 265.0 |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  |  |  | 30.0 |  |  |  |  |
Preferred stock, par value per share (in dollars per share) |  |  |  |  | $ 0.10 |  |  |  |  |
Rollforward of common shares issued [Abstract] |  |  |  |  |  |  |  |  |  |
Common shares issued, beginning balance (in shares) |  |  |  |  | 83.4 | 83.9 | 88.2 |  |  |
Common stock issued under employee stock plans (in shares) |  |  |  |  | 0.6 | 0.6 | 0.5 |  |  |
Common shares repurchased (in shares) |  |  |  |  | (1.8) | (1.1) | (4.8) |  |  |
Common shares issued, ending balance (in shares) |  |  |  | 83.9 | 82.2 | 83.4 | 83.9 |  |  |
Share repurchase program [Abstract] |  |  |  |  |  |  |  |  |  |
Outstanding common stock repurchase authorization |  |  |  |  | $ 830.4 |  |  |  |  |
Foreign Currency Translation Adjustments |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax, Beginning Balance |  |  |  |  | (264.7) | $ (47.6) | $ (462.3) |  |  |
Foreign Currency Translation Adjustments, balance, ending balance |  |  |  | $ (47.6) | (33.0) | (264.7) | (47.6) |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss), before Reclassification and Tax |  |  |  |  | 231.7 | (217.1) |  |  |  |
Current year adjustments, Foreign Currency Translation Adjustments |  |  |  |  | 231.7 | (217.1) | 183.1 |  |  |
Tax effect of adjustments, Foreign Currency Translation Adjustments |  |  |  |  | 0.0 | 0.0 | 0.0 |  |  |
Net Benefit Plan Adjustments |  |  |  |  |  |  |  |  |  |
Net Benefit Plan Adjustments, balance |  |  |  |  | 3.1 | (11.7) | (30.9) |  |  |
Tax effect of adjustments, Net Benefit Plan Adjustments |  |  |  |  | (0.9) | (5.9) | (1.8) |  |  |
Net Benefit Plan Adjustments, balance |  |  |  | (11.7) | 5.4 | 3.1 | (11.7) |  |  |
Accumulated Other Comprehensive Earnings |  |  |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax |  |  |  |  | (1.9) | 23.3 | (4.6) |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax |  |  |  |  | (1.9) | 23.3 | (4.6) |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax |  |  |  |  | 16.2 | (2.6) | 30.1 |  |  |
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax |  |  |  |  | 0.0 | 0.0 | 0.0 |  |  |
Other Comprehensive Income (Loss), before Reclassifications, before Tax |  |  |  |  | 247.9 | (219.7) | 213.2 |  |  |
Tax effect of adjustments, Accumulated Other Comprehensive Earnings |  |  |  |  | (0.9) | (5.9) | (1.8) |  |  |
Accumulated Other Comprehensive Earnings, balance |  |  |  | $ 59.3 | $ 27.6 | $ 261.6 | $ 59.3 |  | $ 493.2 |
Stock Repurchased During Period, Shares |  |  |  | 1.1 | 1.8 | 1.1 | 3.7 |  |  |
Treasury Stock Acquired, Average Cost Per Share |  |  |  |  | $ 254.17 | $ 219.57 | $ 206.85 |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  | $ 1,000.0 |  | $ 2,500.0
Payments for Repurchase of Common Stock |  |  |  |  | $ 450.0 | $ 250.1 | $ 1,000.0 |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred Stock Outstanding |  |  |  |  | 0.0 | 0.0 |  |  |  |
Accumulated Other Comprehensive Loss |  |  |  | $ (59.3) | (27.6) | (261.6) | (59.3) |  | $ (493.2) |
Fortrea Holdings Inc. spin-off |  |  |  |  |  |  | (1,732.0) |  |  |
Other Comprehensive Income (Loss), before Reclassifications, before Tax |  |  |  |  | $ 247.9 | $ (219.7) | $ 213.2 |  |  |
Stock Repurchased and Retired During Period, Shares |  |  |  |  | 1.8 | 1.1 | 4.8 |  |  |
Dividends declared |  |  |  |  | $ (241.1) | $ (242.9) | $ (256.1) |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  | $ 1,000.0 |  | $ 2,500.0
Outstanding common stock repurchase authorization |  |  |  |  | $ 830.4 |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share |  |  |  |  | $ 254.17 | $ 219.57 | $ 206.85 |  |  |
Accelerated Share Repurchases, Settlement (Payment) or Receipt |  |  |  | 1,000.0 |  |  | $ 1,000.0 |  |  |
Sales and Excise Tax Payable |  |  |  | $ 9.0 |  |  | $ 9.0 |  |  |
Common Stock, Dividends, Per Share, Cash Paid |  |  |  |  | $ 2.88 | $ 2.88 | $ 2.88 |  |  |
Common Stock, Shares, Issued |  |  |  | 83.9 | 82.2 | 83.4 | 83.9 |  |  |
Subsequent Event | O2026Q1DividendsMember |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |
Dividends Payable, Amount Per Share |  |  | $ 0.72 |  |  |  |  |  |  |
Dividends Payable, Date of Record |  | Feb. 27, 2026 |  |  |  |  |  |  |  |
Dividends, Common Stock, Cash |  |  | $ 61.0 |  |  |  |  |  |  |
Dividends Payable, Date to be Paid | Mar. 12, 2026 |  |  |  |  |  |  |  |  |
Dividends Payable, Date Declared |  |  | Jan. 14, 2026 |  |  |  |  |  |  |
Pension Plan [Member] |  |  |  |  |  |  |  |  |  |
Foreign Currency Translation Adjustments |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), after Tax |  |  |  |  | $ (11.1) |  | $ (10.9) |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), after Tax |  |  |  |  | (11.1) |  | (10.9) |  |  |
Foreign Currency Gain (Loss) |  |  |  |  |  |  |  |  |  |
Foreign Currency Translation Adjustments |  |  |  |  |  |  |  |  |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), after Tax |  |  |  |  | 0.0 |  | 0.0 |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |
Fortrea Holdings Inc. spin-off |  |  |  |  |  |  | 231.6 |  |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), after Tax |  |  |  |  | 0.0 |  | 0.0 |  |  |
AOCI Attributable to Parent [Member] |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |
Fortrea Holdings Inc. spin-off |  |  |  |  |  |  | 238.0 |  |  |
Dividends declared |  |  |  |  | $ 0.0 | $ 0.0 | 0.0 |  |  |
Net Benefit Plan Adjustments |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |
Fortrea Holdings Inc. spin-off |  |  |  |  |  |  | $ 6.4 |  |  |

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