DEBT - Narrative (Details) - USD ($)		3 Months Ended	6 Months Ended	12 Months Ended
	Dec. 15, 2016	Jun. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Mar. 31, 2017	Mar. 30, 2017	Jul. 31, 2015	Jun. 15, 2011
Debt Instrument [Line Items]
Maximum borrowing capacity					$ 2,200,000,000.0	$ 1,500,000,000
Stock called during period (in shares)	2,900,000
Stock called during period, value	$ 123,100,000
Treasury stock, average cost per share (in dollars per share)			$ 41.78	$ 41.78
Treasury stock		$ 122,000,000	$ 122,000,000	$ 123,100,000
Convertible Debt
Debt Instrument [Line Items]
Strike price of the call transaction (in dollars per share)							$ 26.42	$ 28.72
Strike price of warrant transactions (in dollars per share)							$ 32.22	$ 35.03
Warrants exercised (in shares)		5,485,510	6,617,400
Stock exercised during the period, exercise of warrants (in shares)		1,681,707	1,893,420
Warrants outstanding (in shares)		2,089,802	2,089,802
Cash Flow Hedging | Designated as Hedging Instrument
Debt Instrument [Line Items]
Notional amounts		$ 400,000,000	$ 400,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity					1,000,000,000
Line of credit facility outstanding		$ 380,000,000	$ 380,000,000	$ 165,000,000
Weighted average interest rate on debt		2.60%	2.60%	2.20%
Revolving Credit Facility | Fair Value, Inputs, Level 2
Debt Instrument [Line Items]
Line of credit facility, fair value of amount outstanding		$ 371,000,000	$ 371,000,000
Standby Letters of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity					60,000,000
Swingline Loan
Debt Instrument [Line Items]
Maximum borrowing capacity					60,000,000
Senior Credit Facility
Debt Instrument [Line Items]
Cash balance threshold above which excess amount is not subject to any restriction of use or investment		40,000,000	40,000,000
Incremental financing costs		500,000	500,000
Available borrowings under senior secured revolving credit facility		1,300,000,000	$ 1,300,000,000
Senior Credit Facility | Minimum
Debt Instrument [Line Items]
Line of credit, commitment fee percentage			0.15%
Senior Credit Facility | Maximum
Debt Instrument [Line Items]
Line of credit, commitment fee percentage			0.35%
Senior Credit Facility | Eurodollar | Minimum
Debt Instrument [Line Items]
Interest rates available to the Company at its option			1.00%
Senior Credit Facility | Eurodollar | Maximum
Debt Instrument [Line Items]
Interest rates available to the Company at its option			2.00%
Senior Credit Facility | Federal Funds
Debt Instrument [Line Items]
Interest rates available to the Company at its option			0.50%
Senior Credit Facility | One Month Eurodollar Rate
Debt Instrument [Line Items]
Interest rates available to the Company at its option			1.00%
Senior Credit Facility | Standby Letters of Credit
Debt Instrument [Line Items]
Line of credit facility outstanding		0	$ 0
Letters of credit outstanding		500,000	500,000	$ 500,000
Term Loan A | Cash Flow Hedging | Designated as Hedging Instrument
Debt Instrument [Line Items]
Notional amounts		400,000,000.0	400,000,000.0	150,000,000.0
Term Loan A | Secured Debt
Debt Instrument [Line Items]
Maximum borrowing capacity					500,000,000
Line of credit facility outstanding		$ 500,000,000	$ 500,000,000	$ 500,000,000
Weighted average interest rate on debt		2.60%	2.60%	2.20%
Term Loan A | Secured Debt | Fair Value, Inputs, Level 2
Debt Instrument [Line Items]
Line of credit facility, fair value of amount outstanding		$ 487,900,000	$ 487,900,000
Term Loan A-1 | Secured Debt
Debt Instrument [Line Items]
Maximum borrowing capacity					$ 700,000,000
Line of credit facility outstanding		0	0
Available borrowings under senior secured revolving credit facility		$ 700,000,000	$ 700,000,000
2016 Convertible Senior Notes | Convertible Debt
Debt Instrument [Line Items]
Interest rate on debt	1.625%
Repayments of convertible debt	$ 227,100,000
Shares issued during period (in shares)	2,900,000
Fair value of stock issued	$ 122,000,000
Gain (loss) on extinguishment of debt	$ 0
Debt instrument, principal								$ 230,000,000.0