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Stock-Based Compensation (Details 2) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Stock-based compensation expense |  |  |
Compensation expense recognized | $ 17.4 | $ 15.7 | $ 17.0
Deferred Compensation Equity |  |  |
Restricted Stock Awards |  |  |
Number of common stock deferred (in shares) | 253,520 | 228,047 |
Stock options |  |  |
Number of Shares |  |  |
Outstanding at the beginning of the period (in shares) | 2,276,637 | 2,993,007 | 3,225,131
Options granted (in shares) | 316,345 | 259,035 | 283,975
Options exercised (in shares) | (748,270) | (925,520) | (472,040)
Options forfeited (in shares) | (34,632) | (49,885) | (44,059)
Outstanding at the end of the period (in shares) | 1,810,080 | 2,276,637 | 2,993,007
Weighted Average Price |  |  |
Outstanding at the beginning of the period (in dollars per share) | $ 42.32 | $ 38.76 | $ 35.88
Options granted (in dollars per share) | 92.84 | 73.08 | 64.80
Options exercised (in dollars per share) | 38.44 | 38.63 | 33.81
Options forfeited (in dollars per share) | 81.68 | 56.89 | 48.47
Outstanding at the end of the period (in dollars per share) | $ 52.00 | $ 42.32 | $ 38.76
Weighted-average grant-date fair value | $ 6.7 | $ 5.0 | $ 5.0
Total intrinsic value of options exercised | $ 42.7 | $ 41.7 | $ 15.5
Weighted average contractual term | 5 years 7 months 17 days | 5 years 8 months 16 days | 5 years 8 months 19 days
Number of options exercisable (in shares) | 1,281,126 | 1,666,647 | 2,378,543
Weighted average exercise price of exercisable options (in dollars per share) | $ 39.09 | $ 34.24 | $ 34.87
The weighted average contractual term of options exercisable | 4 years 5 months 5 days | 4 years 8 months 19 days |
Aggregate intrinsic value of options outstanding | $ 63.5 | $ 91.8 |
Total grant date fair value of options vested | 4.6 | 4.0 | $ 8.0
Stock-based compensation expense |  |  |
Compensation expense recognized | 5.1 | 4.5 | 4.9
Unrecognized compensation cost related to stock options | $ 3.7 |  |
Weighted average period of recognition of unrecognized compensation cost related to restricted stock awards | 1 year 11 months 12 days |  |
Award Activity |  |  |
Units granted (in shares) | 316,345 |  |
Restricted stock awards |  |  |
Weighted Average Price |  |  |
Vesting period of shares awarded under the Program | 3 years |  |
Stock-based compensation expense |  |  |
Compensation expense recognized | $ 5.9 | $ 5.1 | $ 4.6
Unrecognized compensation cost related to stock options | $ 4.3 |  |
Weighted average period of recognition of unrecognized compensation cost related to restricted stock awards | 1 year 6 months 29 days |  |
Award Activity |  |  |
Outstanding balance at the beginning of the period (in shares) | 246,988 | 240,990 | 284,235
Units granted (in shares) | 58,040 | 104,773 | 71,255
Units vested and issued (in shares) | (75,740) | (94,590) | (109,445)
Units forfeited (in shares) | (2,881) | (4,185) | (5,055)
Outstanding balance at the end of the period (in shares) | 226,407 | 246,988 | 240,990
Restricted Stock Awards |  |  |
Outstanding balance at the beginning of the period (in dollars per share) | $ 65.14 | $ 49.66 | $ 25.99
Grant date fair value (in dollars per share) | 90.54 | 76.70 | 64.80
Shares vested (in dollars per share) | 49.56 | 38.57 | 34.08
Shares forfeited (in dollars per share) | 81.32 | 63.73 | 47.85
Outstanding balance at the end of the period (in dollars per share) | $ 76.66 | $ 65.14 | $ 49.66
Performance share awards |  |  |
Weighted Average Price |  |  |
Vesting period of shares awarded under the Program | 3 years |  |
Stock-based compensation expense |  |  |
Compensation expense recognized | $ 6.3 | $ 6.0 | $ 6.5
Unrecognized compensation cost related to stock options | $ 3.7 |  |
Weighted average period of recognition of unrecognized compensation cost related to restricted stock awards | 1 year 8 months 1 day |  |
Award Activity |  |  |
Outstanding balance at the beginning of the period (in shares) | 281,475 | 328,990 | 230,730
Units granted (in shares) | 58,040 | 67,970 | 71,255
Units converted to shares | 37,496 | 69,920 | 89,610
Units vested and issued (in shares) | (112,814) | (135,008) | (45,544)
Units vested and deferred (in shares) | (33,611) | (46,212) | (12,006)
Units forfeited (in shares) | (2,340) | (4,185) | (5,055)
Outstanding balance at the end of the period (in shares) | 228,246 | 281,475 | 328,990
Restricted Stock Awards |  |  |
Grant date fair value (in dollars per share) | $ 112.39 | $ 95.72 | $ 91.33
2015 Awards |  |  |
Award Activity |  |  |
Units granted (in shares) | 58,040 |  |
Units forfeited (in shares) | (1,220) |  |
Outstanding balance at the end of the period (in shares) | 56,820 |  |
2014 Awards |  |  |
Award Activity |  |  |
Outstanding balance at the beginning of the period (in shares) | 66,505 |  |
Units granted (in shares) |  | 67,970 |
Units forfeited (in shares) | (750) | (1,465) |
Outstanding balance at the end of the period (in shares) | 65,755 | 66,505 |
2013 Awards |  |  |
Award Activity |  |  |
Outstanding balance at the beginning of the period (in shares) | 68,545 | 70,175 |
Units granted (in shares) |  |  | 71,255
Units converted to shares | 37,496 |  |
Units forfeited (in shares) | (370) | (1,630) | (1,080)
Outstanding balance at the end of the period (in shares) | 105,671 | 68,545 | 70,175
2012 Awards |  |  |
Award Activity |  |  |
Outstanding balance at the beginning of the period (in shares) | 146,425 | 77,595 | 79,340
Units converted to shares |  | 69,920 |
Units vested and issued (in shares) | (112,814) |  |
Units vested and deferred (in shares) | (33,611) |  |
Units forfeited (in shares) |  | (1,090) | (1,745)
Outstanding balance at the end of the period (in shares) |  | 146,425 | 77,595
2011 Awards |  |  |
Award Activity |  |  |
Outstanding balance at the beginning of the period (in shares) |  | 181,220 | 93,840
Units converted to shares |  |  | 89,610
Units vested and issued (in shares) |  | (135,008) |
Units vested and deferred (in shares) |  | (46,212) |
Units forfeited (in shares) |  |  | (2,230)
Outstanding balance at the end of the period (in shares) |  |  | 181,220
2010 Awards |  |  |
Award Activity |  |  |
Outstanding balance at the beginning of the period (in shares) |  |  | 57,550
Units vested and issued (in shares) |  |  | (45,544)
Units vested and deferred (in shares) |  |  | (12,006)
Restricted Stock Units |  |  |
Award Activity |  |  |
Units granted (in shares) | 12,157 |  |
Restricted Stock Awards |  |  |
Grant date fair value (in dollars per share) | $ 90.54 |  |

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