FINANCING ARRANGEMENTS - Narrative (Details) - USD ($)					12 Months Ended
	Oct. 08, 2021	Oct. 28, 2020	Mar. 31, 2020	Jul. 02, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jan. 31, 2022	Dec. 31, 2018
Financing arrangements
Effective interest rate (as a percent)					4.67%
Loss on early extinguishment of debt					$ 0	$ 0	$ 6,131,000
Fair value of long-term obligations, including current portion					2,600,000,000	1,600,000,000
Borrowings from revolving credit facility					0	150,000,000	$ 0
Revolving credit facility, available borrowing capacity					261,400,000
Letters of credit outstanding, amount					138,600,000
Derivative liability					$ 17,400,000	33,600,000
Interest rate swap
Financing arrangements
Basis spread on variable rate (as a percent)					2.92%
Derivative notional amount									$ 350,000,000
Interest rate swap | Subsequent Event
Financing arrangements
Derivative notional amount								$ 600,000,000
Interest rate swap | Subsequent Event | Through June 30, 2023
Financing arrangements
Derivative, fixed interest rate								0.931%
Interest rate swap | Subsequent Event | From July 1, 2023 through September 30, 2027
Financing arrangements
Derivative, fixed interest rate								1.9645%
Secured senior term loans due October 8, 2028 ("2028 Term Loans") | Subsequent Event
Financing arrangements
Debt outstanding								$ 600,000,000
Term Loans with Interest Rate Swap Agreements
Financing arrangements
Debt outstanding									$ 350,000,000
Unsecured debt
Financing arrangements
Redemption percentage of principal amount					100.00%
Debt instrument, redemption price, percentage of principal amount redeemed					35.00%
Unsecured debt | Unsecured senior notes, at 4.875%, due July 15, 2027 ("2027 Notes")
Financing arrangements
Aggregate principal amount				$ 545,000,000
Redemption percentage of principal amount					104.875%
Unsecured debt | Unsecured senior notes, at 5.125%, due July 15, 2029 ("2029 Notes")
Financing arrangements
Aggregate principal amount				300,000,000
Redemption percentage of principal amount					105.125%
Unsecured debt | Unsecured Senior Notes 2021
Financing arrangements
Repurchased amount				845,000,000
Repayments of debt				850,200,000
Accrued interest				$ 4,000,000
Secured debt | Secured senior term loans due October 8, 2028 ("2028 Term Loans")
Financing arrangements
Debt prepayment premium rate, percentage	1.00%
Secured debt | Secured senior term loans due October 8, 2028 ("2028 Term Loans") | Eurodollar
Financing arrangements
Basis spread on variable rate (as a percent)	2.00%
Debt, floor interest rate	0.00%
Secured debt | Secured senior term loans due October 8, 2028 ("2028 Term Loans") | Base rate
Financing arrangements
Basis spread on variable rate (as a percent)	1.00%
Debt, floor interest rate	1.00%
Secured debt | Secured senior term loans due October 8, 2028 ("2028 Term Loans") | HydroChemPSC
Financing arrangements
Aggregate principal amount	$ 1,000,000,000
Net proceeds from the company’s issuance	$ 981,300,000
Secured debt | Secured senior term loans due June 30, 2024 ("2024 Term Loans")
Financing arrangements
Debt outstanding					$ 719,600,000
Secured debt | Secured senior term loans due June 30, 2024 ("2024 Term Loans") | Eurodollar
Financing arrangements
Basis spread on variable rate (as a percent)	1.75%
Secured debt | Secured senior term loans due June 30, 2024 ("2024 Term Loans") | Base rate
Financing arrangements
Basis spread on variable rate (as a percent)	0.75%
Secured debt | Secured senior term loans
Financing arrangements
Effective interest rate (as a percent)					2.04%
LIne of credit
Financing arrangements
Credit facility, maximum borrowing capacity					$ 400,000,000
Period for measurement of average liquidity (in days)					30 days
LIne of credit | Minimum
Financing arrangements
Commitment fee (as a percent)					0.25%
LIne of credit | Maximum
Financing arrangements
Commitment fee (as a percent)					0.375%
LIne of credit | Parent and Domestic Subsidiaries
Financing arrangements
Credit available subject to percentage of accounts receivable (as a percent)		85.00%
Credit available subject to percentage of cash deposited (as a percent)		100.00%
LIne of credit | Canadian Subsidiaries
Financing arrangements
Credit available subject to percentage of accounts receivable (as a percent)		85.00%
Credit available subject to percentage of cash deposited (as a percent)		100.00%
LIne of credit | Revolving credit facility
Financing arrangements
Debt outstanding					$ 0	$ 0
Borrowings from revolving credit facility			$ 150,000,000
LIne of credit | Revolving credit facility | Parent and Domestic Subsidiaries
Financing arrangements
Credit facility, maximum borrowing capacity		$ 350,000,000
LIne of credit | Revolving credit facility | Canadian Subsidiaries
Financing arrangements
Credit facility, maximum borrowing capacity		50,000,000
LIne of credit | Letters of credit | Parent and Domestic Subsidiaries
Financing arrangements
Credit facility, maximum borrowing capacity		$ 250,000,000
LIne of credit | Base rate | Minimum
Financing arrangements
Basis spread on variable rate (as a percent)					0.50%
LIne of credit | Base rate | Maximum
Financing arrangements
Basis spread on variable rate (as a percent)					0.75%
LIne of credit | LIBOR | Minimum
Financing arrangements
Basis spread on variable rate (as a percent)					1.50%
LIne of credit | LIBOR | Maximum
Financing arrangements
Basis spread on variable rate (as a percent)					1.75%