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Accumulated Other Comprehensive Loss - Schedule of Changes in the Components of AOCI (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2022	Jun. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Changes in the components of AOCI
Beginning balance	$ 6,831.3	$ 6,513.6	$ 5,977.9	$ 5,894.8	$ 6,513.6	$ 5,894.8
Net other comprehensive income	1.6	(0.3)	5.0	4.0	1.3	9.0
Ending balance	6,968.5	6,831.3	6,103.1	5,977.9	6,968.5	6,103.1
Total
Changes in the components of AOCI
Beginning balance	(4.4)	(4.1)	(16.6)	(20.6)	(4.1)	(20.6)
Net other comprehensive income	1.6	(0.3)	5.0	4.0	1.3
Ending balance	(2.8)	(4.4)	$ (11.6)	$ (16.6)	(2.8)	$ (11.6)
Minimum Pension Liability
Changes in the components of AOCI
Beginning balance		11.0			11.0
Net other comprehensive income					1.3
Ending balance	12.3				12.3
Foreign Currency
Changes in the components of AOCI
Beginning balance		$ (15.1)			(15.1)
Net other comprehensive income					0.0
Ending balance	$ (15.1)				$ (15.1)

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