Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended
	Nov. 27, 2019	May 08, 2019	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Nov. 06, 2018	May 10, 2017
Class of Stock [Line Items]
Common stock shares authorized			100,000,000.0		100,000,000
Common stock, par value			$ 0.01		$ 0.01
Preferred stock shares authorized			50,000,000.0		50,000,000
Preferred stock, par value			$ 0.01		$ 0.01
Common stock shares issued			33,038,361		33,760,940
Common stock shares outstanding			33,038,361		33,760,940
Preferred stock shares outstanding			0		0
Shares authorized to be repurchased						4,500,000
Treasury Stock Acquired, Average Cost Per Share			$ 61.52
Treasury Stock, Value, Acquired, Cost Method			$ 62.4
Treasury Stock, Shares, Acquired			1,000,000.0
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation			$ 12.1	$ 12.2
Treasury Stock, Retired, Cost Method, Amount			$ 62.4
Treasury Stock, Shares, Retired			1,000,000.0
Maximum [Member]
Class of Stock [Line Items]
Shares available to be purchased			2,799,552
First Amended And Restated 2013 Long-Term Incentive Plan [Member]
Class of Stock [Line Items]
Common stock shares for stock award issuance							1,800,000
2017 Incentive Plan [Member]
Class of Stock [Line Items]
Common stock shares rolled into plan							600,000
Amended 2017 Incentive Plan [Member]
Class of Stock [Line Items]
Additional shares authorized		1,600,000
Common stock shares for stock award, available for issuance			300,000
Vesting of stock-based compensation awards, shares			500,000	600,000
Distribution Agreement [Member]
Class of Stock [Line Items]
Aggregate offering price	$ 100.0
Available for sale, common stock			$ 100.0
Common stock shares sold and issued			0	0