Defined Benefit Pension Plans (Narrative) (Details) - USD ($) $ in Millions	120 Months Ended
	Dec. 30, 2023	Sep. 30, 2017	Dec. 31, 2016
Scenario, Forecast [Member]
Transition Period Pension Plan Amendment	10 years
Non-Qualified Retirement Plans [Member]
Available-for-sale Securities and Other Short-term Investments, Rabbi Trusts		$ 11.3	$ 11.7