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, 2020	$ 452.1		$ 725.1	$ (246.7)	$ 4.5	$ 935.0
Net income			47.2		0.1	47.3
Other comprehensive income				8.0	0.1	8.1
Stock issued	10.0					10.0
Stock purchased	(4.3)				(0.5)	(4.8)
Advance payments		$ 1.1				1.1
Dividends declared			(6.9)			(6.9)
Balance at Mar. 31, 2021	457.8	1.1	765.4	(238.7)	4.2	989.8
Balance at Dec. 31, 2020	452.1		725.1	(246.7)	4.5	935.0
Net income						127.6
Other comprehensive income						16.3
Balance at Jun. 30, 2021	456.3	0.6	838.7	(230.5)	4.4	1,069.5
Balance at Mar. 31, 2021	457.8	1.1	765.4	(238.7)	4.2	989.8
Net income			80.1		0.2	80.3
Other comprehensive income				8.2		8.2
Stock issued	3.8					3.8
Stock purchased	(5.3)					(5.3)
Advance payments		(0.5)				(0.5)
Dividends declared			(6.8)			(6.8)
Balance at Jun. 30, 2021	456.3	0.6	838.7	(230.5)	4.4	1,069.5
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 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						230.2
Other comprehensive income						6.4
Balance at Jun. 30, 2022	462.5	0.5	1,066.2	(174.1)	5.4	1,360.5
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 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