Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Earnings Per Share [Abstract]
Basic	107.3	102.7	106.7	101.8
Weighted Average Number Diluted Shares Outstanding Adjustment	0.4	0.7	0.4	0.6
Diluted	107.7	103.4	107.1	102.4
Net income available to common shareholders	$ 257,000	$ 223,800	$ 493,900	$ 416,300
Earnings (loss) per share - basic	$ 2.40	$ 2.18	$ 4.63	$ 4.09
Earnings (loss) per share - diluted	$ 2.39	$ 2.17	$ 4.61	$ 4.07
Anti-dilutive stock options outstanding that were not included in computation of diluted earnings per common share			0.0	0.0