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Long-Term Incentive Employee Compensation Summary of Stock Options by Exercise Price (Detail) - USD ($) shares in Millions, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Options Outstanding Number | 0.9 | 1.4 | 1.7 | 1.9
Options Outstanding Weighted-Average Remaining Contractual Life (In Years) | 6 years 6 months |  |  |
Options Outstanding Aggregate Intrinsic Value | $ 17.3 |  |  |
Options Exercisable Number | 0.5 | 0.8 | 1.1 |
Options Exercisable Weighted-Average Remaining Contractual Life (In Years) | 5 years 4 months 24 days |  |  |
Options Exercisable Aggregate Intrinsic Value | $ 10.0 |  |  |
Less than $23.00 |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Options Outstanding Number | 0.1 |  |  |
Options Outstanding Weighted-Average Remaining Contractual Life (In Years) | 3 years 6 months |  |  |
Options Outstanding Aggregate Intrinsic Value | $ 3.4 |  |  |
Options Exercisable Number | 0.1 |  |  |
Options Exercisable Weighted-Average Remaining Contractual Life (In Years) | 3 years 6 months |  |  |
Options Exercisable Aggregate Intrinsic Value | $ 3.4 |  |  |
$26.76 Exercise Price |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Options Outstanding Number | 0.1 |  |  |
Options Outstanding Weighted-Average Remaining Contractual Life (In Years) | 5 years 2 months 12 days |  |  |
Options Outstanding Aggregate Intrinsic Value | $ 4.2 |  |  |
Options Exercisable Number | 0.1 |  |  |
Options Exercisable Weighted-Average Remaining Contractual Life (In Years) | 5 years 2 months 12 days |  |  |
Options Exercisable Aggregate Intrinsic Value | $ 4.2 |  |  |
$33.01 Exercise Price |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Options Outstanding Number | 0.3 |  |  |
Options Outstanding Weighted-Average Remaining Contractual Life (In Years) | 8 years 1 month 6 days |  |  |
Options Outstanding Aggregate Intrinsic Value | $ 6.1 |  |  |
Options Exercisable Number | 0.1 |  |  |
Options Exercisable Aggregate Intrinsic Value | $ 0.6 |  |  |
$41.52 Exercise Price |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Options Outstanding Number | 0.2 |  |  |
Options Outstanding Weighted-Average Remaining Contractual Life (In Years) | 7 years 2 months 12 days |  |  |
Options Outstanding Aggregate Intrinsic Value | $ 2.2 |  |  |
Options Exercisable Number | 0.1 |  |  |
Options Exercisable Aggregate Intrinsic Value | $ 0.4 |  |  |
$43.52 Exercise Price |  |  |  |
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |  |  |  |
Options Outstanding Number | 0.2 |  |  |
Options Outstanding Weighted-Average Remaining Contractual Life (In Years) | 6 years 2 months 12 days |  |  |
Options Outstanding Aggregate Intrinsic Value | $ 1.4 |  |  |
Options Exercisable Number | 0.1 |  |  |
Options Exercisable Aggregate Intrinsic Value | $ 1.4 |  |  |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: 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=96867065&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, 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 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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