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Stockholders' Equity - Estimated Amount of Total Share-Based Compensation Expense (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013
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Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
2014 | $ 19.3
2015 | 12.3
2016 | 3.7
2017 | 0.2
Total | 35.5
2013 Three-year PSU Awards [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
2014 | 4.0
2015 | 4.0
2016 |
2017 |
Total | 8.0
2012 Three-year PSU Awards [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
2014 | 1.7
2015 |
2016 |
2017 |
Total | 1.7
2012 President & COO Four-year Incentive Compensation [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
2014 | 0.4
2015 | 0.3
2016 | 0.2
2017 |
Total | 0.9
SLO Awards [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
2014 | 0.7
2015 |
2016 |
2017 |
Total | 0.7
Other Long-term Share-based Incentive Compensation Programs [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
2014 | 12.5
2015 | 8.0
2016 | 3.5
2017 | 0.2
Total | $ 24.2

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- Definition Employee service share-based compensation non-vested awards compensation cost to be recognized in year one. + 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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