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FAIR VALUE MEASUREMENTS - Summary of Fair Value of Assets and Liabilities (Details) - USD ($) $ in Millions	Apr. 02, 2022	Sep. 30, 2021	Aug. 13, 2021	Apr. 03, 2021	Mar. 17, 2021	Oct. 22, 2019	Dec. 15, 2016
Senior notes | 4.000% Senior Notes
Liabilities
Interest rate of debt (percentage)	4.00%	4.00%		4.00%	4.00%
Senior notes | 4.375% Senior Notes
Liabilities
Interest rate of debt (percentage)	4.375%	4.375%	4.375%	4.375%
Senior notes | 4.500% Senior Notes
Liabilities
Interest rate of debt (percentage)	4.50%	4.50%		4.50%		4.50%
Senior notes | 5.250% Senior Notes
Liabilities
Interest rate of debt (percentage)	5.25%	5.25%		5.25%			5.25%
Carrying Amount | Fair value, inputs, level 1 | Fair Value, Measurements, Recurring
Assets
Cash equivalents	$ 3.8	$ 222.5		$ 2.4
Carrying Amount | Fair value, inputs, level 1 | Fair Value, Measurements, Recurring | Investment securities in non-qualified retirement plan assets
Assets
Other	47.4	45.0		43.5
Carrying Amount | Fair value, inputs, level 3 | Fair Value, Measurements, Recurring | Convertible debt investments
Assets
Other	192.4	190.3		0.0
Carrying Amount | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Credit facilities | Revolving loans
Liabilities
Debt instruments	1,135.0	0.0		460.2
Carrying Amount | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Credit facilities | Term loans
Liabilities
Debt instruments	650.0	670.0		690.0
Carrying Amount | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Senior notes | 4.000% Senior Notes
Liabilities
Debt instruments	500.0	500.0		500.0
Carrying Amount | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Senior notes | 4.375% Senior Notes
Liabilities
Debt instruments	400.0	400.0		0.0
Carrying Amount | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Senior notes | 4.500% Senior Notes
Liabilities
Debt instruments	450.0	450.0		450.0
Carrying Amount | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Senior notes | 5.250% Senior Notes
Liabilities
Debt instruments	250.0	250.0		250.0
Carrying Amount | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Receivables facility
Liabilities
Debt instruments	400.0	0.0		160.0
Carrying Amount | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Other debt
Liabilities
Debt instruments	13.6	11.9		7.6
Estimated Fair Value | Fair value, inputs, level 1 | Fair Value, Measurements, Recurring
Assets
Cash equivalents	3.8	222.5		2.4
Estimated Fair Value | Fair value, inputs, level 1 | Fair Value, Measurements, Recurring | Investment securities in non-qualified retirement plan assets
Assets
Other	47.4	45.0		43.5
Estimated Fair Value | Fair value, inputs, level 3 | Fair Value, Measurements, Recurring | Convertible debt investments
Assets
Other	192.4	190.3		0.0
Estimated Fair Value | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Credit facilities | Revolving loans
Liabilities
Debt instruments	1,135.0	0.0		460.2
Estimated Fair Value | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Credit facilities | Term loans
Liabilities
Debt instruments	650.0	670.0		690.0
Estimated Fair Value | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Senior notes | 4.000% Senior Notes
Liabilities
Debt instruments	437.5	498.8		497.5
Estimated Fair Value | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Senior notes | 4.375% Senior Notes
Liabilities
Debt instruments	352.0	402.0		0.0
Estimated Fair Value | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Senior notes | 4.500% Senior Notes
Liabilities
Debt instruments	420.8	466.9		464.6
Estimated Fair Value | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Senior notes | 5.250% Senior Notes
Liabilities
Debt instruments	252.5	258.1		261.6
Estimated Fair Value | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Receivables facility
Liabilities
Debt instruments	400.0	0.0		160.0
Estimated Fair Value | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Other debt
Liabilities
Debt instruments	$ 13.6	$ 11.9		$ 7.6

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