Stockholders' Equity - Estimated Amount of Total Share-based Incentive Compensation Expense (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
2015	$ 22.6
2016	15.0
2017	4.4
Total	42.0
2014 Special PSU Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
2015	10.7
2016	10.2
2017	4.4
Total	25.3
2014 Three-year PSU Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
2015	5.2
2016	4.6
Total	9.8
2013 Three-year PSU Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
2015	5.4
Total	5.4
2012 President & COO Four-year Incentive Compensation [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
2015	0.3
2016	0.2
Total	0.5
SLO Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
2015	1.0
Total	$ 1.0

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

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- Definition

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

+ References

No definition available.

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- Definition

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

+ 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

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