EMPLOYEE BENEFITS (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended	12 Months Ended
	Jan. 15, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
EMPLOYEE BENEFITS
Common stock split conversion ratio	2
Annual expenses for incentive plans		$ 23.2	$ 16.7	$ 17.4
ESOP and 401(k) Plans
Employee Stock Ownership, 401(K) And Deferred Compensation Plan
Vesting period of profit sharing contributions		3 years
Expenses recognized		12.4	7.8	10.6
Employee Stock Ownership Plan (ESOP)
Employee Stock Ownership, 401(K) And Deferred Compensation Plan
Shares purchased under defined contribution plan		140,484	189,282	179,566
Average price of shares purchased (in dollars per share)		$ 35.03	$ 35.01	$ 28.82
Aggregate price of shares purchased		4.9	6.6	5.2
Shares held by the ESOP		3,382,944
Employee 401(k) Plans
Employee Stock Ownership, 401(K) And Deferred Compensation Plan
Employer contribution as a percent of eligible compensation		3.00%
Vesting percentage in basic and voluntary contributions		100.00%
Deferred compensation plan
Employee Stock Ownership, 401(K) And Deferred Compensation Plan
Shares purchased under defined contribution plan		13,922	14,968	19,562
Average price of shares purchased (in dollars per share)		$ 38.33	$ 34.24	$ 29.75
Aggregate price of shares purchased		0.5	0.5	0.6
Assets held under trust		$ 32.5