Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended
	Jan. 26, 2023	Apr. 22, 2021	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Equity, Class of Treasury Stock [Line Items]
Treasury stock shares			6,200,000		6,300,000
Treasury stock, Cost basis			$ 236.2		$ 238.6
Shares repurchased				350,000
2018 Stock Buyback Program [Member]
Equity, Class of Treasury Stock [Line Items]
Number of shares authorized for repurchase	4,300,000	4,300,000
Stock repurchase expiration date	Dec. 31, 2024	Dec. 31, 2022
2018 Stock Buyback Program [Member] | Common Stock [Member]
Equity, Class of Treasury Stock [Line Items]
Shares repurchased			1,700,000	350,000
Shares purchased average cost per share			$ 48.77	$ 52.82
Restricted Stock [Member]
Equity, Class of Treasury Stock [Line Items]
Number of shares nonvested			600,000		700,000