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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS), NET (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
AOCI Rollforward
Beginning balance	$ 3,465.3	$ 3,604.8	$ 3,348.9
Other comprehensive income (loss)	21.6	(86.6)	(19.4)
Ending balance	3,985.0	3,465.3	3,604.8
Accumulated Other Comprehensive (Loss) Income, Net
AOCI Rollforward
Beginning balance	(31.0)	55.6	75.0
Other comprehensive income (loss)	21.6	(86.6)	(19.4)
Ending balance	(9.4)	(31.0)	55.6
Foreign Currency Translation Adjustment
AOCI Rollforward
Beginning balance	(30.2)	55.4
Other comprehensive income (loss)	24.6	(85.6)
Ending balance	(5.6)	(30.2)	55.4
Unrealized Investment Loss
AOCI Rollforward
Beginning balance	(0.9)	(0.1)
Other comprehensive income (loss)	(2.8)	(0.8)
Ending balance	(3.7)	(0.9)	(0.1)
Post-Retirement Benefits
AOCI Rollforward
Beginning balance	0.1	0.3
Other comprehensive income (loss)	(0.2)	(0.2)
Ending balance	$ (0.1)	$ 0.1	$ 0.3

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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