FAIR VALUE MEASUREMENTS (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Interest Rate Swaps [Member]
Summary of fair value instruments
Interest rate swaps	$ (6.7)	$ (8.4)
Interest Rate Swaps [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Summary of fair value instruments
Interest rate swaps	0	0
Interest Rate Swaps [Member] | Significant Other Observable Inputs (Level 2) [Member]
Summary of fair value instruments
Interest rate swaps	(6.7)	(8.4)
Interest Rate Swaps [Member] | Significant Unobservable Inputs (Level 3) [Member]
Summary of fair value instruments
Interest rate swaps	0	0
Available-for-sale Securities [Member]
Summary of fair value instruments
Available-for-sale securities	10.7	14.6
Available-for-sale Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Summary of fair value instruments
Available-for-sale securities	10.7	14.6
Available-for-sale Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Summary of fair value instruments
Available-for-sale securities	0	0
Available-for-sale Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Summary of fair value instruments
Available-for-sale securities	0	0
Deferred Compensation Plan Assets [Member]
Summary of fair value instruments
Other assets, fair value disclosure	10.7	9.4
Deferred Compensation Plan Assets [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Summary of fair value instruments
Other assets, fair value disclosure	0	0
Deferred Compensation Plan Assets [Member] | Significant Other Observable Inputs (Level 2) [Member]
Summary of fair value instruments
Other assets, fair value disclosure	10.7	9.4
Deferred Compensation Plan Assets [Member] | Significant Unobservable Inputs (Level 3) [Member]
Summary of fair value instruments
Other assets, fair value disclosure	0	0
Supplementary Pension Plan Assets [Member]
Summary of fair value instruments
Other assets, fair value disclosure	8.6	8.2
Supplementary Pension Plan Assets [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Summary of fair value instruments
Other assets, fair value disclosure	0	0
Supplementary Pension Plan Assets [Member] | Significant Other Observable Inputs (Level 2) [Member]
Summary of fair value instruments
Other assets, fair value disclosure	8.6	8.2
Supplementary Pension Plan Assets [Member] | Significant Unobservable Inputs (Level 3) [Member]
Summary of fair value instruments
Other assets, fair value disclosure	$ 0	$ 0