Quarterly Data (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 1,775,589,000	$ 1,825,345,000	$ 1,810,706,000	$ 1,724,757,000	$ 1,808,950,000	$ 1,747,403,000	$ 1,798,094,000	$ 1,637,671,000
Gross profit	651,315,000	673,488,000	672,593,000	623,542,000	644,972,000	646,520,000	665,236,000	602,828,000	$ 2,620,938,000	$ 2,559,556,000	$ 2,529,047,000
Earnings from continuing operations	$ 168,122,000	$ 206,006,000	$ 198,085,000	$ 105,705,000	$ 157,975,000	$ 157,305,000	$ 166,456,000	$ 109,409,000	$ 677,918,000	$ 591,145,000	$ 746,663,000
Earnings from continuing operations (in dollars per basic share)	$ 1.16	$ 1.42	$ 1.36	$ 0.73	$ 1.08	$ 1.07	$ 1.10	$ 0.71	$ 4.67	$ 3.94	$ 4.80
Earnings from continuing operations (in dollars per diluted share)	$ 1.15	$ 1.40	$ 1.35	$ 0.72	$ 1.07	$ 1.05	$ 1.08	$ 0.70	$ 4.61	$ 3.89	$ 4.73
Net earnings	$ 168,122,000	$ 206,006,000	$ 198,085,000	$ 105,705,000	$ 141,569,000	$ 157,305,000	$ 139,959,000	$ 131,434,000	$ 677,918,000	$ 570,267,000	$ 811,665,000
Net earnings (in dollars per basic share)	$ 1.16	$ 1.42	$ 1.36	$ 0.73	$ 0.97	$ 1.07	$ 0.92	$ 0.85	$ 4.67	$ 3.80	$ 5.21
Net earnings (in dollars per diluted share)	$ 1.15	$ 1.40	$ 1.35	$ 0.72	$ 0.96	$ 1.05	$ 0.91	$ 0.84	$ 4.61	$ 3.75	$ 5.15
Revenue									$ 7,136,397,000	$ 6,992,118,000	$ 6,820,886,000