DEBT (Narrative) (Details) $ in Millions	1 Months Ended	3 Months Ended	6 Months Ended
	Aug. 31, 2021 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) item	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Debt Instrument [Line Items]
Discounts and debt issuance costs			$ 2.4	$ 11.4
Total long-term debt - face value		$ 2,857.4	3,941.9	2,857.4	$ 3,949.6
Financing costs		72.1	67.7	72.1	69.6
Short-term debt		0.0	176.0	0.0	0.0
Delayed Draw Term Loan Expires 2026 [Member]
Debt Instrument [Line Items]
Borrowings			$ 1,100.0
Proceeds from line of credit	$ 1,600.0
Delayed Draw Term Loan Expires 2026 [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Applicable margin on borrowing rate			0.00%
Delayed Draw Term Loan Expires 2026 [Member] | SOFR [Member]
Debt Instrument [Line Items]
Applicable margin on borrowing rate			0.875%
Letters Of Credit, Expire July 2022 [Member]
Debt Instrument [Line Items]
Self Insurance Reserve			$ 24.8
Supported By Line Of Credit [Member]
Debt Instrument [Line Items]
Outstanding standby letters of credit			$ 78.1
Investment-Grade Type Covenants Governed [Member]
Debt Instrument [Line Items]
Number of indentures with customary investment-grade type covenants | item			2
Bridge Facility And Delayed Draw Term Loan [Member]
Debt Instrument [Line Items]
Discounts and debt issuance costs		9.4
Financing costs					13.3
Line of Credit [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 1,000.0
Commitment fee			0.10%
Available borrowing capacity			$ 745.9
Short-term debt			$ 176.0
Line of Credit [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Applicable margin on borrowing rate			0.125%
Line of Credit [Member] | SOFR [Member]
Debt Instrument [Line Items]
Applicable margin on borrowing rate			1.125%
Line of Credit [Member] | Unsecured Line Of Credit, Maturity Of September 2026 [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 1,000.0
Bridge Facility [Member]
Debt Instrument [Line Items]
Face value		2,200.0		2,200.0
Standby Letters of Credit [Member]
Debt Instrument [Line Items]
Outstanding standby letters of credit			$ 102.9
Period of standby letters of credit			1 year
Self Insurance Reserve			$ 95.4
Standby Letters of Credit [Member] | SOFR [Member]
Debt Instrument [Line Items]
Applicable margin on borrowing rate			0.175%
Maximum [Member] | Delayed Draw Term Loan Expires 2026 [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Applicable margin on borrowing rate			0.25%
Maximum [Member] | Delayed Draw Term Loan Expires 2026 [Member] | SOFR [Member]
Debt Instrument [Line Items]
Applicable margin on borrowing rate			1.25%
Maximum [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Commitment fee			0.225%
Maximum [Member] | Line of Credit [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Applicable margin on borrowing rate			0.625%
Maximum [Member] | Line of Credit [Member] | SOFR [Member]
Debt Instrument [Line Items]
Applicable margin on borrowing rate			1.625%
Minimum [Member] | Delayed Draw Term Loan Expires 2026 [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Applicable margin on borrowing rate			0.00%
Minimum [Member] | Delayed Draw Term Loan Expires 2026 [Member] | SOFR [Member]
Debt Instrument [Line Items]
Applicable margin on borrowing rate			0.75%
Minimum [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Commitment fee			0.09%
Minimum [Member] | Line of Credit [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Applicable margin on borrowing rate			0.00%
Minimum [Member] | Line of Credit [Member] | SOFR [Member]
Debt Instrument [Line Items]
Applicable margin on borrowing rate			1.00%
Term Loan Due [Member] | Delayed Draw Term Loan Expires 2026 [Member]
Debt Instrument [Line Items]
Total long-term debt - face value		0.0	$ 1,100.0	0.0	$ 1,100.0
Maturity year			2026
Notes [Member]
Debt Instrument [Line Items]
Total long-term debt - face value			$ 3,941.9
Notes [Member] | Delayed Draw Term Loan Expires 2026 [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 1,600.0		$ 1,600.0
Notes [Member] | Investment-Grade Type Covenants Governed [Member]
Debt Instrument [Line Items]
Total long-term debt - face value			$ 2,840.2
U.S. Concrete, Inc. [Member] | Senior Notes Due 2029 [Member]
Debt Instrument [Line Items]
Debt assumed in acquisition	$ 434.5