Acquisitions (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Business Acquisition [Line Items]
Current Assets	$ 30,287,000		$ 30,287,000
Property, Plant, and Equipment	6,642,000		6,642,000
Goodwill Acquired			157,874,000
Goodwill - tax deductible	33,183,000		33,183,000
Intangibles	100,524,000		100,524,000
Current Liabilities	20,249,000		20,249,000
Payments to Acquire Businesses, Net of Cash Acquired			258,674,000	$ 216,398
Goodwill and intangible assets	258,398,000		258,398,000
Other assets and deferred charges	16,404,000		16,404,000
Goodwill Acquired During Period, Non-deductible for Income Tax			124,691,000
Revenue [Abstract]
As reported	1,748,256,000	$ 1,825,345,000	4,903,370,000	5,360,808,000
Pro forma	1,752,155,000	1,845,416,000	4,924,687,000	5,428,757,000
Net earnings [Abstract]
As reported	200,300,000	206,006,000	501,345,000	509,796,000
Pro forma	203,133,000	206,333,000	512,190,000	511,425,000
Trademarks [Member]
Business Acquisition [Line Items]
Intangibles	6,631,000		$ 6,631,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			15 years
Customer-Related Intangible Assets
Business Acquisition [Line Items]
Intangibles	79,795,000		$ 79,795,000
Unpatented Technologies [Member]
Business Acquisition [Line Items]
Intangibles	14,098,000		14,098,000
All-Flo [Member]
Business Acquisition [Line Items]
Goodwill - tax deductible		20,567,000		20,567,000
Intangibles		14,980,000		14,980,000
Payments to Acquire Businesses, Net of Cash Acquired				39,954,000
Belanger [Member]
Business Acquisition [Line Items]
Goodwill - tax deductible		98,084,000		98,084,000
Intangibles		$ 77,000,000		77,000,000
Payments to Acquire Businesses, Net of Cash Acquired				$ 175,350,000
Systech [Member]
Business Acquisition [Line Items]
Goodwill Acquired			91,493,000
Intangibles	76,100,000		76,100,000
Payments to Acquire Businesses, Net of Cash Acquired			161,830,000
Soft-Pak [Member]
Business Acquisition [Line Items]
Goodwill - tax deductible	33,183,000		33,183,000
Intangibles	12,800,000		12,800,000
Payments to Acquire Businesses, Net of Cash Acquired			45,500,000
Em-tec [Member]
Business Acquisition [Line Items]
Goodwill Acquired			19,572,000
Intangibles	8,344,000		8,344,000
Payments to Acquire Businesses, Net of Cash Acquired			30,396,000
Solaris [Member]
Business Acquisition [Line Items]
Goodwill Acquired			11,693,000
Intangibles	$ 3,280,000		3,280,000
Payments to Acquire Businesses, Net of Cash Acquired			$ 18,605,000
Minimum [Member] | Customer-Related Intangible Assets
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			10 years
Minimum [Member] | Unpatented Technologies [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			6 years
Minimum [Member] | All-Flo [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life				13 years
Minimum [Member] | Belanger [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life				9 years
Maximum [Member] | Customer-Related Intangible Assets
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			12 years
Maximum [Member] | Unpatented Technologies [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			9 years
Maximum [Member] | All-Flo [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life				15 years
Maximum [Member] | Belanger [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life				15 years