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FAIR VALUE MEASUREMENTS - Summary of Fair Value of Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Sep. 30, 2022	Jan. 01, 2022	Aug. 13, 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	$ 1.9	$ 64.3	$ 1.6
Carrying Amount | Fair value, inputs, level 1 | Fair Value, Measurements, Recurring | Investment securities in non-qualified retirement plan assets
Assets
Other	37.7	38.4	50.1
Carrying Amount | Fair value, inputs, level 3 | Fair Value, Measurements, Recurring | Convertible debt investments
Assets
Other	91.2	117.0	191.3
Carrying Amount | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Credit facilities | Revolving loans
Liabilities
Debt instruments	681.5	300.5	856.5
Carrying Amount | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Credit facilities | Term loans
Liabilities
Debt instruments	962.5	975.0	660.0
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	400.0
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	161.0	75.0	94.0
Carrying Amount | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Other debt
Liabilities
Debt instruments	3.8	12.7	20.6
Estimated Fair Value | Fair value, inputs, level 1 | Fair Value, Measurements, Recurring
Assets
Cash equivalents	1.9	64.3	1.6
Estimated Fair Value | Fair value, inputs, level 1 | Fair Value, Measurements, Recurring | Investment securities in non-qualified retirement plan assets
Assets
Other	37.7	38.4	50.1
Estimated Fair Value | Fair value, inputs, level 3 | Fair Value, Measurements, Recurring | Convertible debt investments
Assets
Other	91.2	117.0	191.3
Estimated Fair Value | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Credit facilities | Revolving loans
Liabilities
Debt instruments	681.5	300.5	856.5
Estimated Fair Value | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Credit facilities | Term loans
Liabilities
Debt instruments	962.5	975.0	660.0
Estimated Fair Value | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Senior notes | 4.000% Senior Notes
Liabilities
Debt instruments	375.6	350.6	495.0
Estimated Fair Value | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Senior notes | 4.375% Senior Notes
Liabilities
Debt instruments	303.0	284.0	399.0
Estimated Fair Value | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Senior notes | 4.500% Senior Notes
Liabilities
Debt instruments	364.5	325.7	468.6
Estimated Fair Value | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Senior notes | 5.250% Senior Notes
Liabilities
Debt instruments	236.3	230.0	256.6
Estimated Fair Value | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Receivables facility
Liabilities
Debt instruments	161.0	75.0	94.0
Estimated Fair Value | Fair value, inputs, level 2 | Fair Value, Measurements, Recurring | Other debt
Liabilities
Debt instruments	$ 3.8	$ 12.7	$ 20.6

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