Acquisitions (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired			$ 215,304	$ 68,557
Current Assets	$ 13,699		13,699
Property, Plant, and Equipment	1,030		1,030
Goodwill	119,035		119,035
Intangibles	91,980		91,980
Current Liabilities	10,460		10,460
Goodwill and intangible assets	211,015		211,015
Other assets and deferred charges	20		20
Revenue [Abstract]
As reported	1,810,706	$ 1,798,094	3,535,463	3,435,765
Pro forma	1,811,980	1,814,828	3,543,691	3,469,366
Net earnings [Abstract]
As reported	198,085	166,456	303,790	275,865
Pro forma	$ 199,094	$ 169,416	$ 306,540	$ 281,482
Basic earnings per share [Abstract]
As reported (in dollars per share)	$ 1.36	$ 1.10	$ 2.09	$ 1.80
Pro forma (in dollars per share)	1.37	1.12	2.11	1.84
Diluted earnings per share [Abstract]
As reported (in dollars per share)	1.35	1.08	2.07	1.77
Pro forma (in dollars per share)	$ 1.35	$ 1.10	$ 2.08	$ 1.81
Customer Relationships [Member]
Business Acquisition [Line Items]
Intangibles	$ 68,500		$ 68,500
Patents [Member]
Business Acquisition [Line Items]
Intangibles	16,000		$ 16,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			9 years
Trademarks [Member]
Business Acquisition [Line Items]
Intangibles	7,480		$ 7,480
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			15 years
All-Flo [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired			$ 39,954
Belanger [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired			175,350
Net assets acquired	$ 215,304		$ 215,304
Ettiingler [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired				$ 53,218
Goodwill		$ 36,070		36,070
Intangibles		19,730		19,730
Rosario [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired				15,339
Goodwill		10,402		$ 10,402
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life				10 years
Rosario [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Intangibles		$ 4,149		$ 4,149
Minimum [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			9 years
Minimum [Member] | Ettiingler [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life				8 years
Maximum [Member] | Customer Relationships [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			13 years
Maximum [Member] | Ettiingler [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life				15 years