Consolidated Condensed Statements of Income (Parenthetical) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Consolidated Condensed Statements Of Income [Abstract]
Pension and post-retirement plans expense reclassified from accumulated other comprehensive income	$ (6,300,000)	$ 900,000	$ (2,900,000)	$ 2,600,000
Income tax benefit reclassified from accumulated other comprehensive income	$ (2,400,000)	$ 300,000	$ (1,100,000)	$ 1,000,000