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FINANCING ARRANGEMENTS - Narrative (Details) - USD ($)		6 Months Ended
	Dec. 17, 2020	Jun. 30, 2021	Dec. 31, 2020	Aug. 27, 2013
Debt Instrument [Line Items]
Long-term debt		$ 1,367,013,000	$ 1,093,301,000
Revolving credit facility | Line of credit
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 1,000,000,000
Maximum leverage ratio		3.50
Long-term debt		$ 271,000,000	$ 0
Average interest rate (percent)		1.22%	0.00%
Revolving credit facility | Line of credit | Federal Funds Rate
Debt Instrument [Line Items]
Basis spread on variable rate (percent)		0.50%
Revolving credit facility | Line of credit | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (percent)		1.13%
Revolving credit facility | Line of credit | Minimum
Debt Instrument [Line Items]
Commitment fee (percent)		0.075%
Revolving credit facility | Line of credit | Maximum
Debt Instrument [Line Items]
Commitment fee (percent)		0.20%
Combinex credit facility | Line of credit
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 3,600,000
Long-term debt		$ 2,280,000	$ 0
Average interest rate (percent)		2.14%	0.00%
US Bank | Line of credit
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 15,000,000
US Bank | Standby letters of credit
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity		$ 8,000,000
Note Purchase Agreement | Senior notes
Debt Instrument [Line Items]
Maximum leverage ratio		3.00
Minimum interest coverage ratio		2.00
Debt instrument principal amount				$ 500,000,000
Long-term debt, fair value		$ 549,300,000
Maximum priority debt to total assets ratio (percent)		15.00%
Debt instrument, redemption price (percent)		100.00%
Senior Notes Due 2028 | Unsecured debt
Debt Instrument [Line Items]
Long-term debt, fair value		$ 686,000,000.0
Debt instrument, redemption price (percent)		101.00%
Debt instrument, annual interest rate (percent)		4.20%
Long-term debt		$ 593,733,000	$ 593,301,000
Debt instrument, effective yield (percent)		4.39%
Threshold for holders of principal outstanding to declare principal and unpaid interest payable (percent)		25.00%
Average interest rate (percent)		4.20%	4.20%
Receivables securitization facility | Secured debt
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 250,000,000
Receivables securitization facility | Secured debt | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (percent)	0.65%

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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