Stock-Based Compensation, Nonvested Restricted Stock Awards (Details) - Restricted Stock Awards [Member]	12 Months Ended
	Dec. 31, 2021 $ / shares shares
Number of Shares [Roll Forward]
Nonvested at beginning of year (in shares) | shares	931,100
Granted (in shares) | shares	380,400
Vested (in shares) | shares	(307,600)
Forfeited (in shares) | shares	(119,000.0)
Nonvested at end of year (in shares) | shares	884,900
Weighted-Average Grant Date Fair Value [Abstract]
Nonvested, beginning balance (in dollars per share) | $ / shares	$ 46.38
Granted (in dollars per share) | $ / shares	50.39
Vested (in dollars per share) | $ / shares	48.59
Forfeited (in dollars per share) | $ / shares	45.95
Nonvested, Ending Balance (in dollars per share) | $ / shares	$ 47.39