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DEBT - Components of Long-Term Debt (Details) - USD ($) $ in Millions	Apr. 03, 2021	Mar. 17, 2021	Sep. 30, 2020	Mar. 28, 2020	Oct. 22, 2019	Dec. 15, 2016
Debt Instrument [Line Items]
Total debt	$ 2,551.3		$ 1,531.2	$ 2,336.5
Less current portions	212.8		66.4	212.2
Long-term debt	2,322.5		1,455.1	2,113.8
Credit Facilities | Revolving loans
Debt Instrument [Line Items]
Total debt	460.2		64.0	691.9
Credit Facilities | Term loans
Debt Instrument [Line Items]
Total debt	$ 690.0		$ 710.0	$ 740.0
Senior Notes | 4.000% Senior Notes
Debt Instrument [Line Items]
Interest rate of debt (percentage)	4.00%	4.00%	4.00%	4.00%
Total debt	$ 500.0		$ 0.0	$ 0.0
Senior Notes | 4.500% Senior Notes
Debt Instrument [Line Items]
Interest rate of debt (percentage)	4.50%		4.50%	4.50%	4.50%
Total debt	$ 450.0		$ 450.0	$ 450.0
Senior Notes | 5.250% Senior Notes
Debt Instrument [Line Items]
Interest rate of debt (percentage)	5.25%		5.25%	5.25%		5.25%
Total debt	$ 250.0		$ 250.0	$ 250.0
Receivables facility
Debt Instrument [Line Items]
Total debt	160.0		20.0	160.0
Finance lease obligations
Debt Instrument [Line Items]
Total debt	33.5		36.1	35.9
Other
Debt Instrument [Line Items]
Total debt	7.6		1.1	8.7
Long-term debt
Debt Instrument [Line Items]
Less unamortized debt issuance costs	$ 16.0		$ 9.7	$ 10.5

X

- Definition

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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- Definition

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

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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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