DEBT - Debt (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Debt Instrument [Line Items]
Total short-term debt	$ 0.0	$ 0.0	$ 0.0
Total long-term debt - face value	3,391.1	3,941.5	3,941.6
Unamortized discounts and debt issuance costs	(59.9)	(63.4)	(67.2)
Fair value adjustments	0.0	(0.3)	3.0
Total long-term debt - book value	3,331.2	3,877.8	3,877.4
Less current maturities	(0.5)	(0.5)	(0.5)
Total long-term debt - reported value	3,330.7	3,877.3	3,876.9
Estimated fair value of long-term debt	3,205.2	3,798.0	3,770.2
Commercial Paper
Debt Instrument [Line Items]
Total short-term debt	0.0	0.0	0.0
Notes | 4.50% notes due 2025
Debt Instrument [Line Items]
Total long-term debt - face value	$ 400.0	400.0	400.0
Interest rate	4.50%
Effective interest rate	4.65%
Notes | 5.80% notes due 2026
Debt Instrument [Line Items]
Total long-term debt - face value	$ 0.0	550.0	$ 550.0
Interest rate	5.80%		5.80%
Notes | 3.90% notes due 2027
Debt Instrument [Line Items]
Total long-term debt - face value	$ 400.0	400.0	$ 400.0
Interest rate	3.90%
Effective interest rate	4.00%
Notes | 3.50% notes due 2030
Debt Instrument [Line Items]
Total long-term debt - face value	$ 750.0	750.0	750.0
Interest rate	3.50%
Effective interest rate	3.94%
Notes | 7.15% notes due 2037
Debt Instrument [Line Items]
Total long-term debt - face value	$ 129.2	129.2	129.2
Interest rate	7.15%
Effective interest rate	8.05%
Notes | 4.50% notes due 2047
Debt Instrument [Line Items]
Total long-term debt - face value	$ 700.0	700.0	700.0
Interest rate	4.50%
Effective interest rate	4.59%
Notes | 4.70% notes due 2048
Debt Instrument [Line Items]
Total long-term debt - face value	$ 460.9	460.9	460.9
Interest rate	4.70%
Effective interest rate	5.42%
Other notes
Debt Instrument [Line Items]
Total long-term debt - face value	$ 1.0	1.4	1.5
Effective interest rate	0.47%
Line Of Credit | Bank line of credit expires 2027
Debt Instrument [Line Items]
Total short-term debt	$ 0.0	0.0	0.0
Line Of Credit | Bank line of credit expires 2027
Debt Instrument [Line Items]
Total long-term debt - face value	$ 0.0	$ 0.0	$ 0.0