Capital Stock (Textuals) (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021	Aug. 24, 2015
Equity, Class of Treasury Stock [Line Items]
Shares repurchased (less than $1 million)		$ 45.0		$ 60.0
Share Repurchase Programs
Equity, Class of Treasury Stock [Line Items]
Shares repurchased (in shares - less than 0.1 million)	100,000		100,000		600,000	700,000
Shares repurchased (less than $1 million)	$ 1.0		$ 1.0		$ 52.0	$ 68.0
2015 Stock Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount							$ 500.0
Shares repurchased (in shares - less than 0.1 million)					500,000	600,000
Shares repurchased (less than $1 million)					$ 46.0	$ 60.0
Remaining authorized amount of repurchase	$ 182.0				$ 182.0
Settlement of Employee Tax Withholding Obligations
Equity, Class of Treasury Stock [Line Items]
Shares repurchased (in shares - less than 0.1 million)	100,000		100,000		100,000	100,000
Shares repurchased (less than $1 million)	$ 1.0		$ 1.0		$ 6.0	$ 8.0