DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Impact of Adoption of New Accounting Pronouncements (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015		Dec. 31, 2014
New Accounting Pronouncement, Early Adoption [Line Items]
Deferred income taxes - noncurrent	$ 149.7	$ 71.3	[1]
Other long-term liabilities	82.4	70.8	[1]
Increase in prepaid expense and other current assets	(8.2)	(13.4)	[2]	$ 8.0	[2]
Increase in accrued expenses and other current liabilities	8.5	7.3	[2]	(22.3)	[2]
Increase in other, net	4.2	(0.5)	[2]	8.4	[2]
Long-Term Debt	2,663.1	1,783.7	[1]
Other Assets	$ 103.1	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		(13.4)		8.0
Increase in accrued expenses and other current liabilities		7.3		(22.3)
Increase in other, net		(0.5)		8.4
Accounting Standards Update 2015-03 [Member]
New Accounting Pronouncement, Early Adoption [Line Items]
Long-Term Debt		1,783.7
Other Assets		84.1
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		(20.5)		15.2
Increase in accrued expenses and other current liabilities		7.3		(22.2)
Increase in other, net		6.6		1.1
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		7.1		(7.2)
Increase in accrued expenses and other current liabilities		0.0		(0.1)
Increase in other, net		(7.1)		$ 7.3
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.