Stockholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		9 Months Ended
	Apr. 22, 2021	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Equity, Class of Treasury Stock [Line Items]
Treasury stock shares		6,200,000		6,200,000		5,100,000
Treasury stock, Cost basis		$ 233.8		$ 233.8		$ 175.8
Shares repurchased		50,000	56,349	1,204,368	56,349
Accelerated Share Repurchase Agreement | Common Stock [Member]
Equity, Class of Treasury Stock [Line Items]
Shares repurchased				1,654,244
Shares purchased average cost per share				$ 48.77
2018 Stock Buyback Program [Member]
Equity, Class of Treasury Stock [Line Items]
Number of shares authorized for repurchase	4,300,000
Stock repurchase expiration date	Dec. 31, 2022
2018 Stock Buyback Program [Member] | Common Stock [Member]
Equity, Class of Treasury Stock [Line Items]
Shares repurchased				1,204,368
Shares purchased average cost per share				$ 48.90
Restricted Stock [Member]
Equity, Class of Treasury Stock [Line Items]
Number of shares nonvested		1,000,000.0		1,000,000.0		1,100,000