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STOCKHOLDERS' EQUITY (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended | 0 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended | 0 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | May 02, 2013 Series A Non-Cumulative Perpetual Convertible Preferred Stock | Apr. 30, 2013 Series A Non-Cumulative Perpetual Convertible Preferred Stock | Apr. 30, 2008 Series A Non-Cumulative Perpetual Convertible Preferred Stock | Jun. 30, 2013 Series A Non-Cumulative Perpetual Convertible Preferred Stock | Jun. 30, 2013 Series A Non-Cumulative Perpetual Convertible Preferred Stock | Jan. 23, 2013 Common Stock | Apr. 30, 2013 Common Stock | Jun. 30, 2013 Common Stock | Jun. 30, 2013 Common Stock
Class of Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued during the period |  |  |  |  |  |  | 200,000 |  |  |  |  |  |
Preferred stock dividend rate (as a percent) |  |  |  |  |  |  | 8.00% |  |  |  |  |  |
Preferred stock liquidation preference (in dollars per share) |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |
Proceeds from issuance of convertible preferred stock |  |  |  |  |  |  | $ 194.1 |  |  |  |  |  |
Preferred shares converted |  |  |  |  | 85,710 |  |  |  |  |  |  |  |
Common stock issued on conversion of convertible preferred stock |  |  |  |  | 5,594,080 |  |  |  |  |  |  |  |
Amount of stock repurchase approved by the Board of Directors |  |  |  |  |  |  |  |  |  | 200.0 |  |  |
Purchase of treasury stock pursuant to the Stock Repurchase Program, shares |  |  | 8,026,807 | 6,784,227 |  |  |  |  |  |  |  |  |
Weighted average price of shares repurchased (in dollars per share) |  |  | $ 24.89 | $ 22.08 |  |  |  |  |  |  |  |  |
Total cost of repurchase of treasury shares | 200.0 | 150.0 | 200.0 | 150.0 |  |  |  |  |  |  |  |  |
Quarterly Dividends |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend per share (in dollars per share) |  |  |  |  |  | $ 20.00 |  |  |  |  |  |  |
Preferred stock cash dividends paid |  |  |  |  |  |  |  | 1.7 | 3.4 |  |  |  |
Dividend per share (in dollars per share) | $ 0.15 | $ 0.10 | $ 0.30 | $ 0.20 |  |  |  |  |  |  | $ 0.15 |  |
Common stock cash dividends paid |  |  |  |  |  |  |  |  |  |  |  | $ 20.6 | $ 41.7

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