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DEBT - Components of Long-Term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2021	Aug. 13, 2021	Mar. 17, 2021	Sep. 30, 2020	Oct. 22, 2019	Dec. 15, 2016
Debt Instrument [Line Items]
Total debt	$ 2,315.3			$ 1,531.2
Finance lease obligations	33.4			36.1
Less current portions	57.8			66.4
Long-term debt	2,236.7			1,455.1
Credit Facilities | Revolving loans
Debt Instrument [Line Items]
Total debt	0.0			64.0
Credit Facilities | Term loans
Debt Instrument [Line Items]
Total debt	670.0			710.0
Senior Notes | Senior Notes – 4.000%
Debt Instrument [Line Items]
Total debt	$ 500.0			$ 0.0
Interest rate (percent)	4.00%		4.00%	4.00%
Senior Notes | Senior Notes – 4.375%
Debt Instrument [Line Items]
Total debt	$ 400.0			$ 0.0
Interest rate (percent)	4.375%	4.375%		4.375%
Senior Notes | Senior Notes - 4.500%
Debt Instrument [Line Items]
Total debt	$ 450.0			$ 450.0
Interest rate (percent)	4.50%			4.50%	4.50%
Senior Notes | Senior Notes – 5.250%
Debt Instrument [Line Items]
Total debt	$ 250.0			$ 250.0
Interest rate (percent)	5.25%			5.25%		5.25%
Receivables facility
Debt Instrument [Line Items]
Total debt	$ 0.0			$ 20.0
Other
Debt Instrument [Line Items]
Total debt	11.9			1.1
Long-term Debt
Debt Instrument [Line Items]
Less unamortized debt issuance costs	$ 20.8			$ 9.7

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Present value of lessee's discounted obligation for lease payments from finance lease.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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