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Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified | 0 Months Ended | 3 Months Ended | 6 Months Ended | 0 Months Ended
--- | --- | --- | --- | ---
Jul. 23, 2013 | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Feb. 26, 2013 Restricted stock, 2013 grant | May 15, 2013 Non-employee director restricted stock award Directors Equity Plan May 2011
Equity |  |  |  |  |  |  |
Issuance of common stock in connection with the exercise of employee stock options (in shares) |  |  |  | 878,167 |  |  |
Total proceeds from the exercise of employee stock options |  |  |  | $ 42.4 | $ 9.7 |  |
Common stock quarterly dividend per share, after increase (in dollars per share) | $ 0.33 |  |  |  |  |  |
Percentage increase in common stock dividends declared (as a percent) | 10.00% |  |  |  |  |  |
Common stock dividends quarterly declared and paid per share (in dollars per share) |  | $ 0.30 | $ 0.15 | $ 0.60 | $ 0.30 |  |
Dividends paid |  |  |  | $ 46.0 | $ 22.5 |  |
Share Based Compensation |  |  |  |  |  |  |
Restricted stock granted (in shares) |  |  |  |  |  | 324,780 | 12,418
Number of years from grant date that recipient is restricted from trading restricted stock |  |  |  |  |  |  | 1 year
The number of grants made during the period on the basis service and performance criteria other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). |  |  |  |  |  | 134,725 |
Fair value of restricted stock granted (in dollars per share) |  |  |  |  |  | $ 65.73 | $ 67.63
Share of common stock |  |  |  |  |  | 1 |
Share Repurchase Program |  |  |  |  |  |  |
Remaining number of common stock authorized for repurchase under stock repurchase program (in shares) |  | 7,883,033 |  | 7,883,033 |  |  |
Number of shares repurchased under stock repurchase program |  |  |  | 0 | 0 |  |
Common Stock |  |  |  |  |  |  |
Cash dividends per share (in dollars per share) | $ 0.33 |  |  |  |  |  |

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