Condensed Consolidated Statements Of Changes In Shareholders’ Equity - USD ($) $ in Millions	Common Stock [Member]	Common Stock Subscribed, Unissued [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Noncontrolling Interests [Member]	Total
Balance at Dec. 31, 2022	$ 531.8		$ 1,141.0	$ (152.8)	$ 5.6	$ 1,525.6
Net income			124.8		0.2	125.0
Other comprehensive (loss) income				0.3		0.3
Stock issued	11.6					11.6
Stock purchased	(5.4)				(0.2)	(5.6)
Advance payments		$ 1.2				1.2
Dividends declared			(8.0)			(8.0)
Balance at Mar. 31, 2023	538.0	1.2	1,257.8	(152.5)	5.6	1,650.1
Balance at Dec. 31, 2022	531.8		1,141.0	(152.8)	5.6	1,525.6
Net income						367.5
Balance at Sep. 30, 2023	535.0	1.1	1,483.5	(152.6)	7.5	1,874.5
Balance at Mar. 31, 2023	538.0	1.2	1,257.8	(152.5)	5.6	1,650.1
Net income			124.2		0.2	124.4
Other comprehensive (loss) income				3.7	0.1	3.8
Stock issued	4.1					4.1
Stock purchased	(6.1)					(6.1)
Dividends declared			(8.1)			(8.1)
Balance at Jun. 30, 2023	536.0	1.2	1,373.9	(148.8)	5.9	1,768.2
Net income			117.7		0.4	118.1
Other comprehensive (loss) income				(3.8)	(0.3)	(4.1)
Stock issued	3.5				1.5	5.0
Stock purchased	(4.5)					(4.5)
Advance payments		(0.1)				(0.1)
Dividends declared			(8.1)			(8.1)
Balance at Sep. 30, 2023	535.0	1.1	1,483.5	(152.6)	7.5	1,874.5
Balance at Dec. 31, 2023	641.3		1,417.1	(177.9)	7.8	1,888.3
Net income			105.2		0.3	105.5
Other comprehensive (loss) income				(2.9)	(0.1)	(3.0)
Stock issued	13.5					13.5
Stock purchased	(5.4)				(0.2)	(5.6)
Advance payments		0.7				0.7
Dividends declared			(9.7)			(9.7)
Balance at Mar. 31, 2024	649.4	0.7	1,512.6	(180.8)	7.8	1,989.7
Balance at Dec. 31, 2023	641.3		1,417.1	(177.9)	7.8	1,888.3
Net income						326.6
Other comprehensive (loss) income						0.7
Balance at Sep. 30, 2024	643.7	1.4	1,713.8	(177.2)	8.1	2,189.8
Balance at Mar. 31, 2024	649.4	0.7	1,512.6	(180.8)	7.8	1,989.7
Net income			110.4		0.2	110.6
Other comprehensive (loss) income				(0.1)		(0.1)
Stock issued	4.1					4.1
Stock purchased	(8.3)				(0.3)	(8.6)
Advance payments		0.7				0.7
Dividends declared			(9.7)			(9.7)
Balance at Jun. 30, 2024	645.2	1.4	1,613.3	(180.9)	7.7	2,086.7
Net income			110.2		0.3	110.5
Other comprehensive (loss) income				3.7	0.1	3.8
Stock issued	4.0					4.0
Stock purchased	(5.5)					(5.5)
Dividends declared			(9.7)			(9.7)
Balance at Sep. 30, 2024	$ 643.7	$ 1.4	$ 1,713.8	$ (177.2)	$ 8.1	$ 2,189.8