Pension and Other Benefit Programs (Summary of Assets Measured at NAV) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]
Investment, Type [Extensible Enumeration]	Real Estate [Member]	Real Estate [Member]
Investments measured at net asset value	$ 4.1	$ 5.6
Unfunded commitments	$ 2.2	$ 2.2
Redemption frequency	Quarterly	Quarterly
Redemption notice period	60 days	60 days