DEBT (Narrative) (Details) $ in Millions		1 Months Ended	3 Months Ended	9 Months Ended
		Aug. 31, 2021 USD ($)	Jun. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) item	Sep. 30, 2021 USD ($)	Aug. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Debt Instrument [Line Items]
Discounts and debt issuance costs				$ 5.0	$ 12.6
Total long-term debt - face value				3,941.9	3,957.2		$ 3,949.6
Financing costs				67.2	70.9		69.6
Commercial Paper						$ 1,600.0
Short-term debt				$ 312.0	0.0		0.0
Delayed Draw Term Loan Expires 2026 [Member]
Debt Instrument [Line Items]
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 In 2023 [Member]
Debt Instrument [Line Items]
Self Insurance Reserve				$ 26.1
Supported By Line Of Credit [Member]
Debt Instrument [Line Items]
Outstanding standby letters of credit				$ 78.0
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				$ 1,600.0
Commitment fee				0.10%
Available borrowing capacity				$ 1,210.0
Short-term debt				$ 312.0
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				$ 1,600.0		1,000.0
Bridge Facility [Member]
Debt Instrument [Line Items]
Face value			2,200.0
Standby Letters of Credit [Member]
Debt Instrument [Line Items]
Outstanding standby letters of credit				$ 104.1
Period of standby letters of credit				1 year
Self Insurance Reserve				$ 96.6
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				$ 550.0	1,100.0	$ 550.0	1,100.0
Maturity year				2026
Notes [Member] | Delayed Draw Term Loan Expires 2026 [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 1,600.0
Notes [Member] | Investment-Grade Type Covenants Governed [Member]
Debt Instrument [Line Items]
Total long-term debt - face value				$ 2,840.2
Commercial Paper [Member]
Debt Instrument [Line Items]
Total long-term debt - face value	[1]			$ 550.0	$ 0.0		$ 0.0
U.S. Concrete [Member] | Senior Notes Due 2029 [Member]
Debt Instrument [Line Items]
Debt assumed in acquisition		$ 434.5

[1] Borrowings on the bank line of credit and commercial paper are classified as short-term if we intend to repay within twelve months and as long-term if we have the intent and ability to extend payment beyond twelve months.