DEBT (Narrative) (Detail) - USD ($) $ in Millions		1 Months Ended		9 Months Ended		12 Months Ended
	Nov. 12, 2014	Dec. 31, 2014	Nov. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Debt Instrument [Line Items]
Proceeds from long-term debt				$ 0.5	$ 1.3
Loss on early extinguishment of debt						$ (22.7)
Fair value of debt		$ 761.5		$ 738.5		761.5
Debt, weighted average interest rate				4.36%	5.37%
Short-term debt		$ 0.0		$ 0.0		$ 0.0
3.95% notes due May 1, 2025
Debt Instrument [Line Items]
Proceeds from long-term debt	$ 250.0
Debt instrument, interest rate, stated percentage				3.95%
Proceeds from debt, net of issuance costs	$ 248.3
6.0% notes due October 1, 2015
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage		6.00%				6.00%
Carrying value of notes repurchased		$ 124.0	$ 17.8
Price of notes repurchased		129.6	18.7
Interest payable		1.3	$ 0.1
8.95% notes due July 1, 2017
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				8.95%
Carrying value of notes repurchased		82.0
Price of notes repurchased		97.8
Interest payable		$ 3.1
Five-year revolving credit line due June 2019
Debt Instrument [Line Items]
Current borrowing of unsecured five-year revolving credit facility				$ 0.0
Remaining borrowing of unsecured five-year revolving credit facility				$ 400.0