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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2015
Stock-Based Compensation |
Schedule of compensation expense |
|  | Years Ended December 31, |
(in millions, except per share amounts) |  | 2015 |  | 2014 |  | 2013 |
Pre-tax compensation expense |  | $ | 5.1 |  | $ | 4.5 |  | $ | 4.9 |
After-tax compensation expense |  | $ | 3.2 |  | $ | 2.8 |  | $ | 3.0 |
Impact on diluted EPS |  | $ | 0.05 |  | $ | 0.04 |  | $ | 0.05 |
Schedule of weighted-average assumptions for stock options |
|  | 2015 |  | 2014 |  | 2013 |
Expected dividend yield |  |  | 1.1 | % |  | 1.2 | % |  | 1.2 | %
Expected life in years |  |  | 5.71 |  |  | 5.74 |  |  | 5.71 |
Expected volatility |  |  | 27.3 | % |  | 29.3 | % |  | 32.2 | %
Risk-free interest rate |  |  | 1.4 | % |  | 1.7 | % |  | 1.0 | %
Weighted-average fair value |  | $ | 21.19 |  | $ | 19.15 |  | $ | 17.58 |
Schedule of stock option activity under the Company's stock option awards |
|  | Shares |  | Weighted-Average Price |
Outstanding at December 31, 2012 |  |  | 3,225,131 |  | $ | 35.88 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Options granted |  |  | 283,975 |  |  | 64.80 |
Options exercised |  |  | (472,040 | ) |  | 33.81 |
Options forfeited |  |  | (44,059 | ) |  | 48.47 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding at December 31, 2013 |  |  | 2,993,007 |  | $ | 38.76 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Options granted |  |  | 259,035 |  |  | 73.08 |
Options exercised |  |  | (925,520 | ) |  | 38.63 |
Options forfeited |  |  | (49,885 | ) |  | 56.89 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding at December 31, 2014 |  |  | 2,276,637 |  | $ | 42.32 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Options granted |  |  | 316,345 |  |  | 92.84 |
Options exercised |  |  | (748,270 | ) |  | 38.44 |
Options forfeited |  |  | (34,632 | ) |  | 81.68 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding at December 31, 2015 |  |  | 1,810,080 |  | $ | 52.00 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of activity related to restricted stock |
|  | Number of Shares |  | Weighted-Average Grant Date Fair Value |
Outstanding at December 31, 2012 |  |  | 284,235 |  | $ | 25.99 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Shares granted |  |  | 71,255 |  |  | 64.80 |
Shares vested |  |  | (109,445 | ) |  | 34.08 |
Shares forfeited |  |  | (5,055 | ) |  | 47.85 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding at December 31, 2013 |  |  | 240,990 |  | $ | 49.66 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Shares granted |  |  | 104,773 |  |  | 76.70 |
Shares vested |  |  | (94,590 | ) |  | 38.57 |
Shares forfeited |  |  | (4,185 | ) |  | 63.73 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding at December 31, 2014 |  |  | 246,988 |  | $ | 65.14 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Shares granted |  |  | 58,040 |  |  | 90.54 |
Shares vested |  |  | (75,740 | ) |  | 49.56 |
Shares forfeited |  |  | (2,881 | ) |  | 81.32 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding at December 31, 2015 |  |  | 226,407 |  | $ | 76.66 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of activity related to performance shares |
|  | Number of Peformance Units |  | 2015 Awards |  | 2014 Awards |  | 2013 Awards |  | 2012 Awards |  | 2011 Awards |  | 2010 Awards |
Outstanding at December 31, 2012 |  |  | 230,730 |  |  | — |  |  | — |  |  | — |  |  | 79,340 |  |  | 93,840 |  |  | 57,550 |
Units granted |  |  | 71,255 |  |  | — |  |  | — |  |  | 71,255 |  |  | — |  |  | — |  |  | — |
Units converted to shares |  |  | 89,610 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 89,610 |  |  | — |
Units vested and issued |  |  | (45,544 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (45,544 | )
Units vested and deferred |  |  | (12,006 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | (12,006 | )
Units forfeited |  |  | (5,055 | ) |  | — |  |  | — |  |  | (1,080 | ) |  | (1,745 | ) |  | (2,230 | ) |  | — |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding at December 31, 2013 |  |  | 328,990 |  |  | — |  |  | — |  |  | 70,175 |  |  | 77,595 |  |  | 181,220 |  |  | — |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Units granted |  |  | 67,970 |  |  | — |  |  | 67,970 |  |  | — |  |  | — |  |  | — |  |  | — |
Units converted to shares |  |  | 69,920 |  |  | — |  |  | — |  |  | — |  |  | 69,920 |  |  | — |  |  | — |
Units vested and issued |  |  | (135,008 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | (135,008 | ) |  | — |
Units vested and deferred |  |  | (46,212 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | (46,212 | ) |  | — |
Units forfeited |  |  | (4,185 | ) |  | — |  |  | (1,465 | ) |  | (1,630 | ) |  | (1,090 | ) |  | — |  |  | — |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding at December 31, 2014 |  |  | 281,475 |  |  | — |  |  | 66,505 |  |  | 68,545 |  |  | 146,425 |  |  | — |  |  | — |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Units granted |  |  | 58,040 |  |  | 58,040 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Units converted to shares |  |  | 37,496 |  |  | — |  |  | — |  |  | 37,496 |  |  | — |  |  | — |  |  | — |
Units vested and issued |  |  | (112,814 | ) |  | — |  |  | — |  |  | — |  |  | (112,814 | ) |  | — |  |  | — |
Units vested and deferred |  |  | (33,611 | ) |  | — |  |  | — |  |  | — |  |  | (33,611 | ) |  | — |  |  | — |
Units forfeited |  |  | (2,340 | ) |  | (1,220 | ) |  | (750 | ) |  | (370 | ) |  | — |  |  | — |  |  | — |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Outstanding at December 31, 2015 |  |  | 228,246 |  |  | 56,820 |  |  | 65,755 |  |  | 105,671 |  |  | — |  |  | — |  |  | — |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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