Condensed Statements of Shareholders' Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Noncontrolling Interest
Total equity						$ 0.0
Balance at Dec. 31, 2021		$ 156.8	$ 1,969.6	$ (488.0)	$ 1,013.8
Common stock repurchased and retired	$ (263.2)	(5.2)	(258.0)
Stock Issued During Period, Value, Stock Options Exercised	5.2	0.2	5.0
Common stock issued for other transactions		0.0	2.2
Stock-based compensation			0.5
Other comprehensive income	26.8			26.8
Net income	393.0				393.0
Common stock dividends paid					(30.8)
Balance at Mar. 31, 2022	2,785.9	$ 151.8	1,719.3	(461.2)	1,376.0
Net loss attributable to noncontrolling interests	0.0					0.0
Contributions received from noncontrolling interests	0.0					0.0
Dividends declared per share of common stock		$ 0.20
Total equity	2,785.9					0.0
Total equity	2,543.6					0.0
Balance at Dec. 31, 2022	2,543.6	$ 132.3	682.7	(495.9)	2,224.5
Common stock repurchased and retired	(206.1)	(3.6)	(202.5)
Stock Issued During Period, Value, Stock Options Exercised	11.2	0.4	10.8
Common stock issued for other transactions		0.2	1.4
Stock-based compensation			(0.8)
Other comprehensive income	13.2			13.2
Net income	154.0				156.3
Common stock dividends paid					(26.2)
Balance at Mar. 31, 2023	2,492.8	$ 129.3	$ 491.6	$ (482.7)	$ 2,354.6
Net loss attributable to noncontrolling interests	(2.3)					(2.3)
Contributions received from noncontrolling interests	44.1					44.1
Dividends declared per share of common stock		$ 0.20
Total equity	$ 2,534.6					$ 41.8