STOCK-BASED COMPENSATION (Details 2) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 30, 2015 item shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($)	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($)	Jun. 30, 2015 $ / shares shares	Jun. 30, 2013 shares	Sep. 04, 2015 USD ($)
Restricted Stock Units
Other Equity Compensation Plans
Nonvested at the beginning of the period (in shares)				2,592,100
Granted (in shares)				1,555,400
Dividend equivalents (in shares)				10,800
Vested (in shares)				(1,242,200)
Forfeited (in shares)				(73,900)
Nonvested at the end of the period (in shares)		2,842,200		2,842,200		2,592,100
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted-Average Grant Date Fair Value
Nonvested at the beginning of the period (in dollars per share) | $ / shares				$ 70.31
Granted (in dollars per share) | $ / shares				77.35
Dividend equivalents (in dollars per share) | $ / shares				83.98
Vested (in dollars per share) | $ / shares				67.76
Forfeited (in dollars per share) | $ / shares				73.25
Nonvested at the end of the period (in dollars per share) | $ / shares		$ 75.25		$ 75.25		$ 70.31
Restricted Stock Units | RSU grants scheduled to vest in fiscal 2017
Other Equity Compensation Plans
RSU grants scheduled to vest (in shares)				544,100
Restricted Stock Units | RSU grants scheduled to vest in fiscal 2018
Other Equity Compensation Plans
RSU grants scheduled to vest (in shares)				559,200
Restricted Stock Units | RSU grants scheduled to vest in fiscal 2019
Other Equity Compensation Plans
RSU grants scheduled to vest (in shares)				452,100
Performance Share Units
Other Equity Compensation Plans
Nonvested at the beginning of the period (in shares)				550,400
Granted (in shares)				277,400
Vested (in shares)						(249,900)
Forfeited (in shares)				(4,500)
Nonvested at the end of the period (in shares)		823,300		823,300		550,400
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted-Average Grant Date Fair Value
Nonvested at the beginning of the period (in dollars per share) | $ / shares				$ 71.59
Granted (in dollars per share) | $ / shares				77.35
Forfeited (in dollars per share) | $ / shares				67.31
Nonvested at the end of the period (in dollars per share) | $ / shares		$ 73.55		$ 73.55		$ 71.59
Performance Share Units | Common Class A
Share-based Compensation Arrangement by Share-based Payment Award
Common Stock issued (in shares)	276,200
Performance Share Units Based on Total Stockholder Return
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted-Average Grant Date Fair Value
Grant date fair value (in USD) | $		$ 11.0		$ 11.0
Method used for estimating grant date fair value				lattice model with a Monte Carlo
Dividend yield (as a percent)				1.00%
Weighted-average expected volatility (as a percent)				32.00%
Performance Share Units Based on Total Stockholder Return | Performance share units based on total stockholders return vesting (contractual term 33 months)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted-Average Grant Date Fair Value
Weighted-average expected life				33 months
Weighted-average risk-free interest rate (as a percent)				0.30%
Performance Share Units Based on Total Stockholder Return | Performance share units based on total stockholders return vesting (contractual term 45 months)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted-Average Grant Date Fair Value
Weighted-average expected life				45 months
Weighted-average risk-free interest rate (as a percent)				0.50%
Performance Share Units Based on Total Stockholder Return | Performance share units based on total stockholders return vesting (contractual term 57 months)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted-Average Grant Date Fair Value
Weighted-average expected life				57 months
Weighted-average risk-free interest rate (as a percent)				0.70%
Performance Share Units Based on Total Stockholder Return | Common Class A
Share-based Compensation Arrangement by Share-based Payment Award
Target payout for performance share units in Class A Common Stock (in shares)				108,507
Performance Share Units Based on Total Stockholder Return | Common Class A | Executive
Share-based Compensation Arrangement by Share-based Payment Award
Target payout for performance share units in Class A Common Stock (in shares)							162,760
Common Stock issued (in shares)	42,549
Performance Share Units Based on Total Stockholder Return | Common Class A | Maximum | Executive
Share-based Compensation Arrangement by Share-based Payment Award
Target payout for performance share units in Class A Common Stock (in shares)				173,611
Long-term Performance Share Units | Common Class A | Executive
Share-based Compensation Arrangement by Share-based Payment Award
Target payout for performance share units in Class A Common Stock (in shares)	387,848
Number of tranches | item	3
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted-Average Grant Date Fair Value
Grant date fair value (in USD) | $								$ 30.0
Long-term Performance Share Units | Common Class A | Executive | Performance period ending June 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award
Target payout for performance share units in Class A Common Stock (in shares)	129,283
Long-term Performance Share Units | Common Class A | Executive | Performance period ending June 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award
Target payout for performance share units in Class A Common Stock (in shares)	129,283
Long-term Performance Share Units | Common Class A | Executive | Performance period ending June 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award
Target payout for performance share units in Class A Common Stock (in shares)	129,283
Share Units
Non-Employee Director Plans
Outstanding at the beginning of the period (in shares)				110,300
Granted (in shares)				8,900
Dividend equivalents (in shares)				700
Outstanding at the end of the period (in shares)		119,900		119,900		110,300
Weighted-Average Grant Date Fair Value Per Share
Outstanding at the beginning of the period (in dollars per share) | $ / shares				$ 41.24
Granted (in dollars per share) | $ / shares				84.35
Dividend equivalents (in dollars per share) | $ / shares				82.89
Outstanding at the end of the period (in dollars per share) | $ / shares		$ 44.69		$ 44.69		$ 41.24
Cash Units
Non-employee Director Deferred Cash Compensation, Cash Payout Shares
Deferred compensation expense (income) to reflect additional deferrals and change in market value (in dollars) | $		$ 1.9	$ 0.6	$ 0.7	$ 0.8