DEBT (Debt) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022	Aug. 31, 2022	Sep. 30, 2021
Debt Instrument [Line Items]
Total short-term debt	$ 0.0		$ 100.0
Total long-term debt - face value	3,941.5		3,941.9
Unamortized discounts and debt issuance costs	(63.4)		(66.2)
Fair value adjustments	(0.3)		0.0
Total long-term debt - book value	3,877.8		3,875.7
Less current maturities	(0.5)		(0.5)
Total long-term debt - reported value	3,877.3		3,875.2
Estimated fair value of long-term debt	3,798.0		3,671.9
Commercial Paper [Member]
Debt Instrument [Line Items]
Total short-term debt	$ 0.0		0.0
Maturity year	2027
Term Loan Due [Member] | Delayed Draw Term Loan Due 2026 [Member]
Debt Instrument [Line Items]
Total long-term debt - face value	$ 0.0		550.0	$ 550.0	$ 1,100.0
Maturity year	2026
Notes [Member]
Debt Instrument [Line Items]
Total long-term debt - face value	$ 3,941.5
Notes [Member] | Bank Line Of Credit Due 2027 [Member]
Debt Instrument [Line Items]
Maturity year	2027
Notes [Member] | Delayed Draw Term Loan Due 2026 [Member]
Debt Instrument [Line Items]
Total long-term debt - face value	$ 550.0
Notes [Member] | 4.50% Notes Due 2025 [Member]
Debt Instrument [Line Items]
Total long-term debt - face value	$ 400.0		400.0
Interest rate	4.50%
Maturity year	2025
Effective interest rate	4.65%
Notes [Member] | 5.80% Notes Due 2026 [Member]
Debt Instrument [Line Items]
Total long-term debt - face value	$ 550.0	$ 550.0	0.0
Interest rate	5.80%	5.80%
Maturity year	2026
Effective interest rate	6.02%
Notes [Member] | 3.90% Notes Due 2027 [Member]
Debt Instrument [Line Items]
Total long-term debt - face value	$ 400.0		400.0
Interest rate	3.90%
Maturity year	2027
Effective interest rate	4.00%
Notes [Member] | 3.50% Notes Due 2030 [Member]
Debt Instrument [Line Items]
Total long-term debt - face value	$ 750.0		750.0
Interest rate	3.50%
Maturity year	2030
Effective interest rate	3.94%
Notes [Member] | 7.15% Notes Due 2037 [Member]
Debt Instrument [Line Items]
Total long-term debt - face value	$ 129.2		129.2
Interest rate	7.15%
Maturity year	2037
Effective interest rate	8.05%
Notes [Member] | 4.50% Notes Due 2047 [Member]
Debt Instrument [Line Items]
Total long-term debt - face value	$ 700.0		700.0
Interest rate	4.50%
Maturity year	2047
Effective interest rate	4.59%
Notes [Member] | 4.70% Notes Due 2048 [Member]
Debt Instrument [Line Items]
Total long-term debt - face value	$ 460.9		460.9
Interest rate	4.70%
Maturity year	2048
Effective interest rate	5.42%
Other Notes [Member]
Debt Instrument [Line Items]
Total long-term debt - face value	$ 1.4		1.8
Effective interest rate	0.36%
Line Of Credit [Member] | Bank Line Of Credit Due 2027 [Member]
Debt Instrument [Line Items]
Total short-term debt	$ 0.0		100.0
Maturity year	2027
Line Of Credit [Member] | Bank Line Of Credit Due 2027 [Member]
Debt Instrument [Line Items]
Total long-term debt - face value	$ 0.0		$ 0.0