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Stock-based Compensation Plans (Details) $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Feb. 17, 2017 service_period shares | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 22, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation | $ |  | $ 5.8 | $ 4.9 | $ 17.5 | $ 14.3 |
February 17, 2017 [Member] | Performance Share Units [Member] | Executive Long-Term Incentive Compensation Plan (the “ELTI Plan”) [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Payout Curve, Maximum Percentage of Original Award | 200.00% |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Percentage Increase in Awards If In Top Quartile | 25.00% |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Percentage Decrease If In Bottom Quartile | 25.00% |  |  |  |  |
February 17, 2017 [Member] | Performance-Based Awards [Member] | Performance Share Units [Member] | Executive Long-Term Incentive Compensation Plan (the “ELTI Plan”) [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Other Award | 3 years |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Requisite Service Periods | service_period | 3 |  |  |  |  |
February 23, 2016 [Member] | Performance Share Units [Member] | Executive Long-Term Incentive Compensation Plan (the “ELTI Plan”) [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Maximum number of performance share units as percentage of original award (in percent) |  |  |  |  |  | 250.00%
February 23, 2016 [Member] | RSUs, PSUs, and Other Employee Awards [Member] | Executive Long-Term Incentive Compensation Plan (the “ELTI Plan”) [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock-based compensation | $ |  | $ 5.8 | $ 4.8 | $ 17.5 | $ 14.3 |
NEOs [Member] | February 17, 2017 [Member] | Restricted Stock Units (RSUs) [Member] | Executive Long-Term Incentive Compensation Plan (the “ELTI Plan”) [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares | 25,119 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Performance period under adopted ELTI Plan | service_period | 3 |  |  |  |  |
NEOs [Member] | February 17, 2017 [Member] | Performance Share Units [Member] | Executive Long-Term Incentive Compensation Plan (the “ELTI Plan”) [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares | 28,467 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Other Award | 34 months |  |  |  |  |
Grantees [Member] | February 17, 2017 [Member] | Restricted Stock Units (RSUs) [Member] | Executive Long-Term Incentive Compensation Plan (the “ELTI Plan”) [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | shares | 61,530 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Performance period under adopted ELTI Plan | service_period | 3 |  |  |  |  |

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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, 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 (a)(1) -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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