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Equity (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 258 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jul. 21, 2015 | Jul. 30, 2015 | Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Dec. 31, 2014
Equity |  |  |  |  |  |  |  |
Proceed from option exercises |  |  | $ 4.5 |  | $ 10.6 | $ 21.3 |  |
Preferred stock, par value (in dollars per share) |  |  | $ 0.001 |  | $ 0.001 |  | $ 0.001 | $ 0.001
Common stock, par value (in dollars per share) |  |  | 0.001 |  | 0.001 |  | $ 0.001 | $ 0.001
Common stock dividend quarterly declared and paid per share (in dollars per share) |  |  | $ 0.40 | $ 0.35 | $ 0.80 | $ 0.70 |  |
Share Repurchase Plan |  |  |  |  |  |  |  |
Number of shares repurchased under stock repurchase plan |  |  | 251,165 |  | 3,438,400 |  | 20,600,000 |
Average costs per share |  |  | $ 59.97 |  | $ 58.17 |  | $ 29.17 |
Value of shares repurchased |  |  | $ 15.1 |  | $ 200.0 |  |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |
Stock options exercised (in shares) |  |  | 112,175 |  | 221,731 |  |  |
Dividends paid |  |  | $ 29.7 | $ 27.2 | $ 60.4 | $ 54.4 |  |
Subsequent event |  |  |  |  |  |  |  |
Share Repurchase Plan |  |  |  |  |  |  |  |
Number of shares repurchased under stock repurchase plan |  | 1,206,586 |  |  |  |  |  |
Average costs per share |  | $ 59.11 |  |  |  |  |  |
Value of shares repurchased |  | $ 71.3 |  |  |  |  |  |
Number of shares authorized by the Board of Directors to be repurchased under stock repurchase plan |  | 2,478,247 |  |  |  |  |  |
Shares outstanding ( as a percent) |  | 3.00% |  |  |  |  |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |
Common stock quarterly dividend per share (in dollars per share) | $ 0.40 |  |  |  |  |  |  |
Restricted stock |  |  |  |  |  |  |  |
Changes in unvested restricted stock grants and RSUs |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 12,719 |  |  |
RSU's, 2012 grant |  |  |  |  |  |  |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |
Restricted stock units that vested |  |  |  |  | 258,719 |  |  |
RSU's |  |  |  |  |  |  |  |
Changes in unvested restricted stock grants and RSUs |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 557,760 |  |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |
Dividend equivalents |  |  |  |  | $ 1.0 |  |  |
Performance targets Period |  |  |  |  | 3 years |  |  |
RSU's | Performance-based |  |  |  |  |  |  |  |
Changes in unvested restricted stock grants and RSUs |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 225,450 |  |  |
Unvested RSUs and Restricted Stock |  |  |  |  |  |  |  |
Changes in unvested restricted stock grants and RSUs |  |  |  |  |  |  |  |
Unvested at the beginning of the period (in shares) |  | 1,249,525 |  |  | 846,760 |  |  |
Granted (in shares) |  |  |  |  | 570,479 |  |  |
Vested (in shares) |  |  |  |  | (75,719) |  |  |
Canceled (in shares) |  |  |  |  | (91,995) |  |  |
Unvested at the end of the period (in shares) |  |  | 1,249,525 |  | 1,249,525 |  | 1,249,525 |
Shares reserved for future grants (all plans) |  |  |  |  | 2,088,837 |  |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |
Unvested at the beginning of the period (in dollars per share) |  | $ 63.31 |  |  | $ 65.10 |  |  |
Granted (in dollars per shares) |  |  |  |  | 59.42 |  |  |
Vested (in dollars per shares) |  |  |  |  | 58.87 |  |  |
Canceled (in dollars per shares) |  |  |  |  | 58.06 |  |  |
Unvested at the end of the period (in dollars per shares) |  |  | $ 63.31 |  | $ 63.31 |  | $ 63.31 |

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