TREASURY STOCK (Details) (USD $)
In Millions, except Share data, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||
---|---|---|---|---|
Mar. 31, 2012
|
Sep. 30, 2012
|
Sep. 30, 2011
|
Dec. 31, 2011
|
|
Equity [Abstract] | ||||
Authorized one-time purchase of common stock value | $ 200.0 | |||
Repurchase of common stock (in shares) | 263,913 | |||
Repurchase of common stock aggregate cost | 166.2 | |||
Remaining authorization of repurchase common stock | 459.2 | |||
Repurchase of common shares to satisfy employee withholding tax obligations related to stock-based compensation (in shares) | 138,576 | 356,979 | ||
Repurchase of common shares to satisfy employee withholding tax obligations related to stock-based compensation | $ 89.2 | $ 162.4 | ||
Treasury stock, shares (in shares) | 8,182,134 | 7,779,645 |