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Stock-Based Compensation Plans - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Share-based compensation plans |  |  |
Shares authorized for future grant | 2,000,955 |  |
Additional share-based compensation disclosures |  |  |
Proceed from option exercises | $ 37.5 | $ 15.1 | $ 28.8
Stock options |  |  |
Number of shares |  |  |
Outstanding at the beginning of the year (in shares) | 934,325 | 1,327,412 | 1,937,241
Exercised (in shares) | (753,645) | (390,606) | (593,204)
Expired or forfeited (in shares) |  | (2,481) | (16,625)
Outstanding at the end of the year (in shares) | 180,680 | 934,325 | 1,327,412
Exercisable at the end of the year (in shares) | 180,680 |  |
Weighted Average Exercise Price |  |  |
Outstanding at the beginning of the year, Weighted Average Exercise Price (in dollars per share) | $ 50.26 | $ 49.66 | $ 49.35
Exercised, Weighted Average Exercise Price (in dollars per share) | 49.70 | 48.19 | 48.58
Expired or forfeited, Weighted Average Exercise Price (in dollars per share) |  | 51.96 | 52.13
Outstanding at the end of the year, Weighted Average Exercise Price (in dollars per share) | 52.61 | $ 50.26 | $ 49.66
Exercisable at the end of the year, Weighted Average Exercise Price (in dollars per share) | $ 52.61 |  |
Weighted Average Remaining Contractual Term |  |  |
Weighted Average Remaining Contractual Term, stock options outstanding (in years) | 1 year 3 months 18 days |  |
Weighted Average Remaining Contractual Term, stock options exercisable (in years) | 1 year 3 months 18 days |  |
Aggregate Intrinsic Value (In millions) |  |  |
Aggregate Intrinsic Value, options outstanding | $ 4.9 |  |
Aggregate Intrinsic Value, options exercisable | $ 4.9 |  |
Vesting period (in years) | 4 years |  |
Award expiration term (in years) | 7 years |  |
Changes in non-vested stock options |  |  |
Non-vested | 0 | 0 |
Additional share-based compensation disclosures |  |  |
Proceed from option exercises | $ 37.5 | $ 15.1 | $ 28.8
Total intrinsic value of all options exercised | 16.3 | 4.8 | 13.5
Tax benefit realized from option exercises | $ 14.3 | $ 7.6 | $ 10.7
Stock options | Non-employee director |  |  |
Number of shares |  |  |
Outstanding at the end of the year (in shares) | 54,000 |  |
Aggregate Intrinsic Value (In millions) |  |  |
Vesting period (in years) | 1 year |  |
Options with ten-year term | Non-employee director |  |  |
Aggregate Intrinsic Value (In millions) |  |  |
Award expiration term (in years) | 10 years |  |

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- Definition Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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