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ACCUMULATED OTHER COMPREHENSIVE LOSS, NET (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023
AOCI Rollforward
Beginning balance	$ 3,664.4	$ 3,538.7	$ 3,465.3	$ 3,261.9	$ 3,567.3	$ 3,604.8	$ 3,465.3
Other comprehensive income (loss)	(49.0)	9.8	18.8	(71.9)	(61.0)	(26.5)
Ending balance	3,788.3	3,664.4	3,538.7	3,293.8	3,261.9	3,567.3	3,788.3
Accumulated Other Comprehensive (Loss) Income, Net
AOCI Rollforward
Beginning balance	(2.4)	(12.2)	(31.0)	(31.9)	29.1	55.6	(31.0)
Other comprehensive income (loss)	(49.0)	9.8	18.8	(71.9)	(61.0)	(26.5)	(20.4)
Ending balance	(51.4)	$ (2.4)	(12.2)	$ (103.8)	$ (31.9)	$ 29.1	(51.4)
Foreign Currency Translation Adjustment
AOCI Rollforward
Beginning balance			(30.2)				(30.2)
Other comprehensive income (loss)							(17.7)
Ending balance	(47.9)						(47.9)
Unrealized Investment Loss
AOCI Rollforward
Beginning balance			(0.9)				(0.9)
Other comprehensive income (loss)							(2.6)
Ending balance	$ (3.5)						(3.5)
Post-Retirement Benefits
AOCI Rollforward
Beginning balance			$ 0.1				0.1
Other comprehensive income (loss)							$ (0.1)

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

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