Acquisitions (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Business Acquisition [Line Items]
Current Assets	$ 25,699,000		$ 25,699,000
Property, Plant, and Equipment	3,783,000		3,783,000
Goodwill Acquired			145,337,000
Goodwill - tax deductible	33,159,000		33,159,000
Intangibles	97,244,000		97,244,000
Current Liabilities	18,380,000		18,380,000
Payments to Acquire Businesses, Net of Cash Acquired			238,839,000	$ 215,304
Goodwill and intangible assets	242,581,000		242,581,000
Other assets and deferred charges	14,844,000		14,844,000
Goodwill Acquired During Period, Non-deductible for Income Tax			112,178,000
Revenue [Abstract]
As reported	1,499,175,000	$ 1,810,706,000	3,155,114,000	3,535,463,000
Pro forma	1,502,018,000	1,828,174,000	3,165,053,000	3,575,903,000
Net earnings [Abstract]
As reported	124,766,000	198,085,000	301,045,000	303,790,000
Pro forma	128,377,000	198,659,000	308,844,000	304,881,000
Trademarks [Member]
Business Acquisition [Line Items]
Intangibles	6,171,000		$ 6,171,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			15 years
Customer-Related Intangible Assets
Business Acquisition [Line Items]
Intangibles	79,295,000		$ 79,295,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			12 years
Other Intangible Assets [Member]
Business Acquisition [Line Items]
Intangibles	11,778,000		$ 11,778,000
All-Flo [Member]
Business Acquisition [Line Items]
Goodwill - tax deductible		20,951,000		20,951,000
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			92,606,000
Intangibles	76,100,000		76,100,000
Payments to Acquire Businesses, Net of Cash Acquired			162,943,000
Soft-Pak [Member]
Business Acquisition [Line Items]
Goodwill - tax deductible	33,159,000		33,159,000
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
Minimum [Member] | Other Intangible Assets [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] | Other Intangible Assets [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