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FAIR VALUE MEASUREMENTS - Summary of Fair Value of Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2021	Aug. 13, 2021	Mar. 17, 2021	Sep. 30, 2020	Oct. 22, 2019	Dec. 15, 2016
Senior Notes | Senior Notes – 4.000%
Liabilities
Interest rate (percent)	4.00%		4.00%	4.00%
Senior Notes | Senior Notes – 4.375%
Liabilities
Interest rate (percent)	4.375%	4.375%		4.375%
Senior Notes | Senior Notes - 4.500%
Liabilities
Interest rate (percent)	4.50%			4.50%	4.50%
Senior Notes | Senior Notes – 5.250%
Liabilities
Interest rate (percent)	5.25%			5.25%		5.25%
Reported Value Measurement | Fair value, inputs, level 2 | Senior Notes | Senior Notes – 4.000%
Liabilities
Long-term debt	$ 500.0			$ 0.0
Reported Value Measurement | Fair value, inputs, level 2 | Senior Notes | Senior Notes – 4.375%
Liabilities
Long-term debt	400.0			0.0
Reported Value Measurement | Fair value, inputs, level 2 | Senior Notes | Senior Notes - 4.500%
Liabilities
Long-term debt	450.0			450.0
Reported Value Measurement | Fair value, inputs, level 2 | Senior Notes | Senior Notes – 5.250%
Liabilities
Long-term debt	250.0			250.0
Reported Value Measurement | Fair value, inputs, level 2 | Receivables facility
Liabilities
Long-term debt	0.0			20.0
Reported Value Measurement | Fair value, inputs, level 2 | Credit Facilities | Revolving loans
Liabilities
Long-term debt	0.0			64.0
Reported Value Measurement | Fair value, inputs, level 2 | Credit Facilities | Term loans
Liabilities
Long-term debt	670.0			710.0
Estimate of Fair Value Measurement | Fair value, inputs, level 2 | Senior Notes | Senior Notes – 4.000%
Liabilities
Long-term debt	498.8			0.0
Estimate of Fair Value Measurement | Fair value, inputs, level 2 | Senior Notes | Senior Notes – 4.375%
Liabilities
Long-term debt	402.0			0.0
Estimate of Fair Value Measurement | Fair value, inputs, level 2 | Senior Notes | Senior Notes - 4.500%
Liabilities
Long-term debt	466.9			476.4
Estimate of Fair Value Measurement | Fair value, inputs, level 2 | Senior Notes | Senior Notes – 5.250%
Liabilities
Long-term debt	258.1			266.6
Estimate of Fair Value Measurement | Fair value, inputs, level 2 | Receivables facility
Liabilities
Long-term debt	0.0			20.0
Estimate of Fair Value Measurement | Fair value, inputs, level 2 | Credit Facilities | Revolving loans
Liabilities
Long-term debt	0.0			64.0
Estimate of Fair Value Measurement | Fair value, inputs, level 2 | Credit Facilities | Term loans
Liabilities
Long-term debt	670.0			710.0
Fair Value, Measurements, Recurring | Reported Value Measurement | Fair value, inputs, level 1
Assets
Cash equivalents	222.5			2.4
Fair Value, Measurements, Recurring | Reported Value Measurement | Fair value, inputs, level 1 | Investment securities in non-qualified retirement plan assets
Assets
Other	45.0			29.8
Fair Value, Measurements, Recurring | Reported Value Measurement | Fair value, inputs, level 2 | Other Long-term Debt
Liabilities
Long-term debt	11.9			1.1
Fair Value, Measurements, Recurring | Reported Value Measurement | Fair value, inputs, level 3 | Convertible debt investments
Assets
Convertible debt investments	190.3			0.0
Fair Value, Measurements, Recurring | Reported Value Measurement | Fair value, inputs, level 3 | Bonnie Option
Assets
Other	0.0			23.3
Fair Value, Measurements, Recurring | Reported Value Measurement | Fair value, inputs, level 3 | Loans receivable
Assets
Other	35.8			100.0
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Fair value, inputs, level 1
Assets
Cash equivalents	222.5			2.4
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Fair value, inputs, level 1 | Investment securities in non-qualified retirement plan assets
Assets
Other	45.0			29.8
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Fair value, inputs, level 2 | Other Long-term Debt
Liabilities
Long-term debt	11.9			1.1
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Fair value, inputs, level 3 | Convertible debt investments
Assets
Convertible debt investments	190.3			0.0
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Fair value, inputs, level 3 | Bonnie Option
Assets
Other	0.0			23.3
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Fair value, inputs, level 3 | Loans receivable
Assets
Other	$ 35.8			$ 112.8

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