Employee Benefit Plans (Defined Contribution Plan) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Payment Arrangement [Abstract]
Percentage of employer contribution as percentage of first three percentage of eligible compensation	100.00%
Percentage of eligible compensation contributed by employer	3.00%
Percentage of employer contribution as percentage of next two percentage of eligible compensation	50.00%
Percentage of eligible compensation contributed by each employee	2.00%
Total expense recorded for matching 401(k) contributions	$ 62.4	$ 59.3	$ 55.7