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Stock-Based Incentive Plans (Details) $ / shares in Units, $ in Millions |  |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 20, 2016 $ / shares shares | Feb. 01, 2016 $ / shares shares | Sep. 30, 2016 USD ($) plan shares | Sep. 30, 2015 USD ($) | Dec. 31, 2015 shares
Stock-Based Compensation |  |  |  |  |
Number of stock-based incentive plans | plan |  |  | 1 |  |
Number of stock option plans superseded | plan |  |  | 2 |  |
Granted (in shares) |  |  | 0 |  | 0
Stock options outstanding and expected to vest |  |  | 0 |  |
Total intrinsic value of options exercised (in dollars) | $ |  |  | $ 2.4 | $ 1.6 |
Unrecognized compensation cost and vesting period |  |  |  |  |
Unrecognized compensation costs related to unvested share-based compensation arrangements | $ |  |  | $ 25.4 |  |
Weighted-average period for recognition of unrecognized stock-based compensation expense |  |  | 1 year 10 months 24 days |  |
Restricted Stock Units |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Awarded (in shares) |  | 431,439 | 442,000 |  |
Weighted average granted date fair value (in dollars per share) | $ / shares | $ 38.00 | $ 32.63 |  |  |
Total intrinsic value of awards vested (in dollars) | $ |  |  | $ 10.8 | $ 10.1 |
Non Employee Directors | Restricted Stock Units |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Awarded (in shares) | 1,800 |  |  |  |

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- Definition Represents the number of stock option plans superseded by the entity and replaced by another plan during the period.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=6415400&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=6415400&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=6415400&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=6415400&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=6415400&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=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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