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ACQUISITIONS (Narrative) (Details) £ / shares in Units, € in Millions, £ in Millions, $ in Millions |  |  |  | 1 Months Ended | 3 Months Ended | 7 Months Ended | 12 Months Ended |  |  |
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Dec. 12, 2023 USD ($) | Dec. 12, 2023 GBP (£) | Oct. 01, 2021 USD ($) | Oct. 01, 2021 EUR (€) | May 24, 2021 USD ($) | Dec. 31, 2023 USD ($) | Apr. 30, 2022 USD ($) | Apr. 30, 2022 EUR (€) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2023 GBP (£) | Dec. 12, 2023 £ / shares | May 31, 2021 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for acquisitions, net |  |  |  |  |  |  |  |  |  |  | $ 99.6 | $ 6.3 | $ 193.0 |  |  |
OnTheMarket |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, expected tax deductible amount |  |  |  |  |  | $ 0.0 |  |  |  |  | 0.0 |  |  |  |  |
Transaction costs |  |  |  |  |  | 11.0 |  |  |  |  | 11.0 |  |  |  |  |
Intangible assets | $ 55.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of identifiable net assets acquired | 120.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
OnTheMarket | North America |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill acquired |  |  |  |  |  | 62.8 |  |  |  |  |  |  |  |  |  |
Business Immo |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill acquired |  |  |  |  |  |  | $ 7.1 |  |  |  |  |  |  |  |  |
Cash paid for acquisitions, net |  |  |  |  |  |  | 6.3 | € 5.8 |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  | $ 3.9 |  |  |  |  |  |  |  |  |
BureauxLocaux |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price |  |  | $ 40.6 | € 35.0 |  |  |  |  |  |  |  |  |  |  |  |
Goodwill acquired |  |  |  |  |  |  |  |  | $ 27.4 |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  | $ 18.3 | $ 18.3 |  |  | $ 18.3 |  |  |
Homes.com |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, expected tax deductible amount |  |  |  |  | $ 20.0 |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  | 53.4 |  |  |  |  |  |  |  |  |  |  |
Purchase price before adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 150.0
Fair value of identifiable net assets acquired |  |  |  |  | 152.2 |  |  |  |  |  |  |  |  |  |  | $ 152.2
Business combinations cash escrow payment employee compensation post combination |  |  |  |  |  |  |  |  |  |  | 5.0 |  |  |  |  |
Business combination tax liabilities accrual amount |  |  |  |  |  | 6.6 |  |  |  |  | 6.6 |  |  |  |  |
Increase in revenue |  |  |  |  |  |  |  |  |  | 13.6 |  |  |  |  |  |
Decrease in net income |  |  |  |  |  |  |  |  |  | $ 23.5 |  |  |  |  |  |
Homes.com | North America |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill acquired |  |  |  |  | $ 91.9 |  |  |  |  |  |  |  |  |  |  |
OnTheMarket plc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price of acquisition (in pound per share) | £ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | £ 1.10 |
Payment for acquisition | 117.9 | £ 94.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities incurred | 2.6 | 2.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price | $ 120.4 | £ 96.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration payable |  |  |  |  |  | $ 5.1 |  |  |  |  | $ 5.1 |  |  | £ 4.0 |  |

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