Condensed Consolidated Statements Of Changes In Shareholders’ Equity - USD ($) $ in Millions	Common Stock	Common Stock Subscribed, Unissued	Retained Earnings	Accumulated Other Comprehensive Loss	Noncontrolling Interests	Total
Balance at Dec. 31, 2021	$ 456.7		$ 850.3	$ (180.5)	$ 5.4	$ 1,131.9
Net income			102.2		0.2	102.4
Other comprehensive (loss) income				6.5	0.1	6.6
Stock issued	10.4					10.4
Stock purchased	(4.1)				(0.3)	(4.4)
Advance payments		$ 1.1				1.1
Dividends declared			(7.0)			(7.0)
Balance at Mar. 31, 2022	463.0	1.1	945.5	(174.0)	5.4	1,241.0
Balance at Dec. 31, 2021	456.7		850.3	(180.5)	5.4	1,131.9
Net income						356.5
Other comprehensive (loss) income						12.4
Balance at Sep. 30, 2022	462.1	1.0	1,185.3	(167.8)	5.3	1,485.9
Balance at Mar. 31, 2022	463.0	1.1	945.5	(174.0)	5.4	1,241.0
Net income			127.6		0.2	127.8
Other comprehensive (loss) income				(0.1)	(0.1)	(0.2)
Stock issued	3.7					3.7
Stock purchased	(4.2)				(0.1)	(4.3)
Advance payments		(0.6)				(0.6)
Dividends declared			(6.9)			(6.9)
Balance at Jun. 30, 2022	462.5	0.5	1,066.2	(174.1)	5.4	1,360.5
Net income			126.1		0.2	126.3
Other comprehensive (loss) income				6.3	(0.3)	6.0
Stock issued	2.9					2.9
Stock purchased	(3.3)					(3.3)
Advance payments		0.5				0.5
Dividends declared			(7.0)			(7.0)
Balance at Sep. 30, 2022	462.1	1.0	1,185.3	(167.8)	5.3	1,485.9
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					5.0
Stock issued					1.5
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