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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 126.3	$ 169.2	$ 301.5	$ 547.0
Other comprehensive income:
Change in fair value of cash flow swaps	(29.2)	11.4	(19.8)	9.0
Income tax benefit (expense) associated with cash flow swaps	7.3	(2.8)	5.0	(2.2)
Unrealized gains (losses) on available-for-sale debt securities	9.8	(3.7)	5.4	(5.4)
Income tax (expense) benefit associated with available-for-sale debt securities	(2.0)	0.9	(1.1)	1.4
Comprehensive income	$ 112.1	$ 175.0	$ 290.9	$ 549.8

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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