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Stock Based Compensation Stock Options - Range of Exercise Prices (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock Options Outstanding	2.0
Weighted-average Exercise Price Per Share	$ 29.22	$ 27.08	$ 26.95	$ 25.01
Weighted-average Contractual Life	1 year 220 days
Stock Options Exercisable	2.0
Weighted-average Exercise Price Per Share	$ 29.22	$ 28.02	$ 27.25
Share-based Compensation Arrangement by Share-based Payment Award, Options, Range of Exercise Prices, $9.19-$15.58 [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock Options Outstanding	0.4
Weighted-average Exercise Price Per Share	$ 13.35
Weighted-average Contractual Life	3 years 329 days
Stock Options Exercisable	0.4
Weighted-average Exercise Price Per Share	$ 13.35
Share-based Compensation Arrangement by Share-based Payment Award, Options, Range of Exercise Prices, $19.54-$26.65 [Member] [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock Options Outstanding	0.6
Weighted-average Exercise Price Per Share	$ 26.07
Weighted-average Contractual Life	2 years 110 days
Stock Options Exercisable	0.6
Weighted-average Exercise Price Per Share	$ 26.07
Share-based Compensation Arrangement by Share-based Payment Award, Options, Range of Exercise Prices,$33.71-$40.83 [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock Options Outstanding	1.0
Weighted-average Exercise Price Per Share	$ 38.53
Weighted-average Contractual Life	0 years 36 days
Stock Options Exercisable	1.0
Weighted-average Exercise Price Per Share	$ 38.53

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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock 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=6415400&loc=d3e5070-113901

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- Definition

Weighted average price at which grantees can acquire the shares reserved for issuance under the stock 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)(i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ 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)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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

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- Definition

Weighted average remaining contractual term of outstanding stock options, 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=6415400&loc=d3e5070-113901

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