Carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company.

No definition available.

FAIR VALUE MEASUREMENTS - Fair value on a nonrecurring basis (Details) - USD ($) $ in Millions			3 Months Ended	12 Months Ended
	Dec. 29, 2017	Jun. 30, 2017	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Sep. 14, 2018
Fair value measurements
Other than Temporary Impairment Losses, Investments					$ 16.0	$ 208.0
Other Fair Value Measurement Disclosures
Operating lease right-of-use assets, net				$ 4,796.0
Property owned, net				157.7
Total loss on Operating lease right-of-use assets				60.0
Total loss on equity interest investment	$ 3.5	$ 204.5		3.6
Total losses				87.9	13.8	43.6
Impairment of long-lived assets			$ 13.8	84.3	13.8	$ 43.6
Current maturities of corporate borrowings, carrying value			15.2	20.0	15.2
Corporate borrowings, noncurrent, carrying value			4,707.8	4,733.4	4,707.8
Other long-term assets
Other Fair Value Measurement Disclosures
Total loss on equity interest investment				3.6
Impairment of long-lived assets				1.2
Nonrecurring basis
Other Fair Value Measurement Disclosures
Total losses				23.1	13.8
2.95% Senior Unsecured Convertible Notes due 2024
Other Fair Value Measurement Disclosures
Convertible debt, carrying value			524.3	515.6	524.3		$ 587.5
Convertible debt, fair value							$ 600.0
Total Carrying Value
Other Fair Value Measurement Disclosures
Operating lease right-of-use assets				123.3
Total carrying Value				157.7
Current maturities of corporate borrowings, carrying value			15.2	20.0	15.2
Corporate borrowings, noncurrent, carrying value			4,707.8	4,733.4	4,707.8
Total Carrying Value \| Other long-term assets
Other Fair Value Measurement Disclosures
Property owned, net				3.0
Equity interest investment				2.2
Total Carrying Value \| Nonrecurring basis
Other Fair Value Measurement Disclosures
Property owned, net			17.3	29.2	17.3
Significant other observable inputs (Level 2)
Other Fair Value Measurement Disclosures
Current maturities of corporate borrowings, fair value			13.4	20.4	13.4
Corporate borrowings, noncurrent, fair value			3,909.2	4,135.3	3,909.2
Significant unobservable inputs (Level 3)
Other Fair Value Measurement Disclosures
Property owned, net			17.3		17.3
Operating lease right-of-use assets				123.3
Total carrying Value				157.7
Current maturities of corporate borrowings, fair value			1.4		1.4
Corporate borrowings, noncurrent, fair value			475.2	514.9	475.2
Significant unobservable inputs (Level 3) \| Other long-term assets
Other Fair Value Measurement Disclosures
Property owned, net				3.0
Equity interest investment				2.2
Significant unobservable inputs (Level 3) \| Nonrecurring basis
Other Fair Value Measurement Disclosures
Property owned, net			$ 17.3	29.2	17.3
NCM
Other Fair Value Measurement Disclosures
Total loss on equity interest investment				$ 16.0	$ 208.0