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ACCUMULATED OTHER COMPREHENSIVE LOSS, NET (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2024
AOCI Rollforward |  |  |  |  |
Beginning balance | $ 4,024.1 | $ 3,985.0 | $ 3,538.7 | $ 3,465.3 | $ 3,985.0
Other comprehensive (loss) income | (3.2) | (13.8) | 9.8 | 18.8 |
Ending balance | 4,021.7 | 4,024.1 | 3,664.4 | 3,538.7 | 4,021.7
Accumulated Other Comprehensive Loss, Net |  |  |  |  |
AOCI Rollforward |  |  |  |  |
Beginning balance | (23.2) | (9.4) | (12.2) | (31.0) | (9.4)
Other comprehensive (loss) income | (3.2) | (13.8) | 9.8 | 18.8 | (17.0)
Ending balance | (26.4) | (23.2) | $ (2.4) | $ (12.2) | (26.4)
Foreign Currency Translation Adjustment |  |  |  |  |
AOCI Rollforward |  |  |  |  |
Beginning balance |  | (5.6) |  |  | (5.6)
Other comprehensive (loss) income |  |  |  |  | (16.2)
Ending balance | (21.8) |  |  |  | (21.8)
Unrealized Investment Loss |  |  |  |  |
AOCI Rollforward |  |  |  |  |
Beginning balance |  | (3.7) |  |  | (3.7)
Other comprehensive (loss) income |  |  |  |  | (1.0)
Ending balance | (4.7) |  |  |  | (4.7)
Post-Retirement Benefits |  |  |  |  |
AOCI Rollforward |  |  |  |  |
Beginning balance |  | $ (0.1) |  |  | (0.1)
Other comprehensive (loss) income |  |  |  |  | 0.2
Ending balance | $ 0.1 |  |  |  | $ 0.1

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