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Stock-Based Incentive Plans - Narrative (Details) $ / shares in Units, $ in Millions |  |  |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
May 16, 2017 shares | May 15, 2017 $ / shares | Feb. 04, 2017 $ / shares shares | Sep. 30, 2017 USD ($) plan shares | Sep. 30, 2016 USD ($) | Dec. 31, 2016 shares
Stock-Based Compensation |  |  |  |  |  |
Number of stock-based incentive plans | plan |  |  |  | 1 |  |
Number of stock option plans superseded | plan |  |  |  | 2 |  |
Granted (in shares) | shares |  |  |  | 0 |  | 0
Total intrinsic value of options exercised (in dollars) | $ |  |  |  | $ 1.7 | $ 2.4 |
Unrecognized compensation cost and vesting period |  |  |  |  |  |
Unrecognized compensation costs related to unvested share-based compensation arrangements | $ |  |  |  | $ 17.3 |  |
Weighted-average period for recognition of unrecognized stock-based compensation expense |  |  |  | 2 years 3 months 30 days |  |
Restricted Stock Units |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |
Awarded (in shares) | shares |  |  | 606,299 | 616,000 |  |
Total intrinsic value of awards vested (in dollars) | $ |  |  |  | $ 11.0 | $ 10.8 |
Non Employee Directors | Restricted Stock Units |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |
Awarded (in shares) | shares | 10,066 |  |  |  |  |
Weighted average granted date fair value (in dollars per share) | $ / shares |  | $ 41.52 | $ 43.42 |  |  |

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- Definition Represents the number of stock option plans superseded by the entity and replaced by another plan during the period. + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the 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 (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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