DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impact of Adoption of New Accounting Pronouncements (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015		Dec. 31, 2015
New Accounting Pronouncement, Early Adoption [Line Items]
Deferred income taxes - noncurrent	$ 64.9			$ 71.3	[1]
Other long-term liabilities	72.8			70.8	[1]
Increase in prepaid expense and other current assets	(21.2)	$ (18.2)	[2]
Decrease in accrued expenses and other current liabilities	(45.6)	(27.8)	[2]
Long-Term Debt	1,783.6			1,783.7	[1]
Other Assets	$ 89.4			84.1	[1]
Accounting Standards Update 2015-17 [Member]
New Accounting Pronouncement, Early Adoption [Line Items]
Deferred income taxes - current				0.0
Deferred income taxes - noncurrent				71.3
Other long-term liabilities				70.8
Increase in prepaid expense and other current assets		(18.2)
Decrease in accrued expenses and other current liabilities		(27.8)
Accounting Standards Update 2015-03 [Member]
New Accounting Pronouncement, Early Adoption [Line Items]
Long-Term Debt				1,783.7
Other Assets				84.1
Scenario, Previously Reported [Member] | Accounting Standards Update 2015-17 [Member]
New Accounting Pronouncement, Early Adoption [Line Items]
Deferred income taxes - current				58.0
Deferred income taxes - noncurrent				40.3
Other long-term liabilities				97.8
Increase in prepaid expense and other current assets		(18.3)
Decrease in accrued expenses and other current liabilities		(27.7)
Scenario, Previously Reported [Member] | Accounting Standards Update 2015-03 [Member]
New Accounting Pronouncement, Early Adoption [Line Items]
Long-Term Debt				1,803.7
Other Assets				104.1
Restatement Adjustment [Member] | Accounting Standards Update 2015-17 [Member]
New Accounting Pronouncement, Early Adoption [Line Items]
Deferred income taxes - current				(58.0)
Deferred income taxes - noncurrent				31.0
Other long-term liabilities				(27.0)
Increase in prepaid expense and other current assets		0.1
Decrease in accrued expenses and other current liabilities		$ (0.1)
Restatement Adjustment [Member] | Accounting Standards Update 2015-03 [Member]
New Accounting Pronouncement, Early Adoption [Line Items]
Long-Term Debt				(20.0)
Other Assets				$ (20.0)

[1] Adjusted as a result of the adoption of certain accounting pronouncements beginning on January 1, 2016. See Note 1, "Description of Business and Summary of Significant Accounting Policies - Recently Adopted Accounting Pronouncements" for details of these adjustments.

[2] Adjusted as a result of the adoption of certain accounting pronouncements beginning on January 1, 2016. See Note 1, "Description of Business and Summary of Significant Accounting Policies - Recently Adopted Accounting Pronouncements" for details of these adjustments.