LONG-TERM DEBT - Credit Agreement Narrative (Details) - USD ($)							1 Months Ended	3 Months Ended		12 Months Ended
	Apr. 01, 2016	May. 29, 2015	Apr. 01, 2015	Jan. 22, 2015	Feb. 06, 2014	Aug. 05, 2013	Jul. 31, 2014	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Feb. 20, 2015
Long-term debt, net of unamortized debt discount [Line Items]
Loss on extinguishment of debt								$ 94,000,000		$ 20,000,000	$ 129,600,000	$ 65,000,000
Unamortized discounts										(348,200,000)
Series D-2 and Series C-2, Tranche B, Term Loan Facility
Long-term debt, net of unamortized debt discount [Line Items]
Loss on extinguishment of debt									$ 21,000,000
Series A-2 Tranche A Term Loan Facility
Long-term debt, net of unamortized debt discount [Line Items]
Unamortized discounts										(800,000)	(2,600,000)
Quarterly amortization payment										$ 8,000,000
Series A-2 Tranche A Term Loan Facility | B&L
Long-term debt, net of unamortized debt discount [Line Items]
Amount borrowed						$ 850,000,000
Series A-2 Tranche A Term Loan Facility | Base Rate
Long-term debt, net of unamortized debt discount [Line Items]
Margins										1.25%
Series A-2 Tranche A Term Loan Facility | LIBOR
Long-term debt, net of unamortized debt discount [Line Items]
Margins										2.25%
Series E-1 Tranche B Term Loan Facility
Long-term debt, net of unamortized debt discount [Line Items]
Amount borrowed					$ 2,950,000,000
Unamortized discounts										$ (16,600,000)	(4,000,000)
Series E-1 Tranche B Term Loan Facility | B&L
Long-term debt, net of unamortized debt discount [Line Items]
Amount borrowed						$ 3,200,000,000
Series E-1 Tranche B Term Loan Facility | Base Rate
Long-term debt, net of unamortized debt discount [Line Items]
Margins										2.00%
Series E-1 Tranche B Term Loan Facility | LIBOR
Long-term debt, net of unamortized debt discount [Line Items]
Margins										3.00%
Series A-3 Tranche A Term Loan Facility
Long-term debt, net of unamortized debt discount [Line Items]
Amount borrowed				$ 250,000,000	$ 226,000,000
Unamortized discounts										$ (28,800,000)	(26,500,000)
Quarterly amortization payment										$ 104,000,000
Series A-3 Tranche A Term Loan Facility | Base Rate
Long-term debt, net of unamortized debt discount [Line Items]
Margins										1.25%
Series A-3 Tranche A Term Loan Facility | LIBOR
Long-term debt, net of unamortized debt discount [Line Items]
Margins										2.25%
Secured Debt
Long-term debt, net of unamortized debt discount [Line Items]
Periodic principal payment							$ 1,000,000,000
Incremental Term Loan Facilities
Long-term debt, net of unamortized debt discount [Line Items]
Debt issuance cost			$ 85,000,000
Unamortized discounts			(21,000,000)
Incremental Term Loan Facilities | Salix
Long-term debt, net of unamortized debt discount [Line Items]
Maximum borrowing capacity			5,150,000,000.00										$ 5,150,000,000.00
Series A-4 Tranche Term Loan Facility
Long-term debt, net of unamortized debt discount [Line Items]
Maximum borrowing capacity			$ 1,000,000,000.00
Unamortized discounts										$ (11,200,000)
Quarterly amortization rate, year one			5.00%
Quarterly amortization rate, year two			10.00%
Quarterly amortization rate, year three			20.00%
Series A-4 Tranche Term Loan Facility | Base Rate
Long-term debt, net of unamortized debt discount [Line Items]
Margins										1.25%
Series A-4 Tranche Term Loan Facility | LIBOR
Long-term debt, net of unamortized debt discount [Line Items]
Margins										2.25%
Series A-4 Tranche Term Loan Facility | Amortization payment period one
Long-term debt, net of unamortized debt discount [Line Items]
Quarterly amortization payment										$ 13,000,000
Series A-4 Tranche Term Loan Facility | Amortization payment period two
Long-term debt, net of unamortized debt discount [Line Items]
Quarterly amortization payment										25,000,000
Series A-4 Tranche Term Loan Facility | Amortization payment period three
Long-term debt, net of unamortized debt discount [Line Items]
Quarterly amortization payment										50,000,000
Series A-4 Tranche Term Loan Facility | Minimum | Base Rate
Long-term debt, net of unamortized debt discount [Line Items]
Margins			0.75%
Series A-4 Tranche Term Loan Facility | Minimum | LIBOR
Long-term debt, net of unamortized debt discount [Line Items]
Margins			1.75%
Series A-4 Tranche Term Loan Facility | Maximum | Base Rate
Long-term debt, net of unamortized debt discount [Line Items]
Margins			1.25%
Series A-4 Tranche Term Loan Facility | Maximum | LIBOR
Long-term debt, net of unamortized debt discount [Line Items]
Margins			2.25%
Series F Tranche B Term Loan Facility
Long-term debt, net of unamortized debt discount [Line Items]
Maximum borrowing capacity			$ 4,150,000,000.00
Unamortized discounts										(63,100,000)
Quarterly amortization rate, year one			1.00%
Quarterly amortization payment										$ 10,000,000
Series F Tranche B Term Loan Facility | Base Rate
Long-term debt, net of unamortized debt discount [Line Items]
Margins										2.25%
Variable rate floor (as a percent)			1.75%							1.75%
Series F Tranche B Term Loan Facility | LIBOR
Long-term debt, net of unamortized debt discount [Line Items]
Margins										3.25%
Variable rate floor (as a percent)			0.75%							0.75%
Series F Tranche B Term Loan Facility | Minimum | Base Rate
Long-term debt, net of unamortized debt discount [Line Items]
Margins			2.00%
Series F Tranche B Term Loan Facility | Minimum | LIBOR
Long-term debt, net of unamortized debt discount [Line Items]
Margins			3.00%
Series F Tranche B Term Loan Facility | Maximum | Base Rate
Long-term debt, net of unamortized debt discount [Line Items]
Margins			2.25%
Series F Tranche B Term Loan Facility | Maximum | LIBOR
Long-term debt, net of unamortized debt discount [Line Items]
Margins			3.25%
Series D-2 Tranche B Term Loan Facility | Base Rate
Long-term debt, net of unamortized debt discount [Line Items]
Margins		1.75%
Variable rate floor (as a percent)		1.75%
Series D-2 Tranche B Term Loan Facility | LIBOR
Long-term debt, net of unamortized debt discount [Line Items]
Margins		2.75%
Variable rate floor (as a percent)		0.75%
Series D-2 Tranche B Term Loan Facility | Minimum | Base Rate
Long-term debt, net of unamortized debt discount [Line Items]
Basis spread in future periods		1.75%
Series D-2 Tranche B Term Loan Facility | Minimum | LIBOR
Long-term debt, net of unamortized debt discount [Line Items]
Basis spread in future periods		2.75%
Series D-2 Tranche B Term Loan Facility | Maximum | Base Rate
Long-term debt, net of unamortized debt discount [Line Items]
Basis spread in future periods		1.50%
Series D-2 Tranche B Term Loan Facility | Maximum | LIBOR
Long-term debt, net of unamortized debt discount [Line Items]
Basis spread in future periods		2.50%
Series A-1 Tranche A Term Loan Facility
Long-term debt, net of unamortized debt discount [Line Items]
Unamortized discounts										$ (600,000)	$ (1,700,000)
Quarterly amortization payment										$ 11,000,000
Series A-1 Tranche A Term Loan Facility | Base Rate
Long-term debt, net of unamortized debt discount [Line Items]
Margins										1.25%
Series A-1 Tranche A Term Loan Facility | LIBOR
Long-term debt, net of unamortized debt discount [Line Items]
Margins										2.25%
Senior Secured Credit Facilities
Long-term debt, net of unamortized debt discount [Line Items]
Percentage of cash proceeds from asset sales outside the ordinary course of business payable as mandatory prepayments										100.00%
Percentage of net cash proceeds of insurance and condemnation proceeds for property or asset losses										100.00%
Percentage of cash proceeds from issuance of equity securities payable as mandatory prepayments										50.00%
Percentage of cash proceeds from incurrence of debt										100.00%
Percentage of annual excess cash flow										50.00%
Percentage of capital stock of the entity and domestic subsidiaries pledged as collateral for borrowings										100.00%
Percentage of capital stock of foreign subsidiaries pledged as collateral for borrowings										65.00%
Revolving credit facility
Long-term debt, net of unamortized debt discount [Line Items]
Maximum borrowing capacity				$ 1,500,000,000.00								$ 1,000,000,000.0
Revolving credit facility | Senior Secured Credit Facilities
Long-term debt, net of unamortized debt discount [Line Items]
Commitment fee, unutilized commitments, percentage										0.50%
Subsequent event
Long-term debt, net of unamortized debt discount [Line Items]
Prepayment of debt	$ 125,000,000