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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

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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=6415400&loc=d3e5070-113901

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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

+ 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

+ 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=6415400&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=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

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=6415400&loc=d3e5070-113901

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- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ 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 (g)

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

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- Definition

The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ 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 (g)

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

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Capital Stock and Share Based Compensation Plans - Options outstanding and exercisable (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Information about options outstanding and options exercisable by year of grant
Range of Exercise Prices, Lower Range Limit (USD per share)	$ 7
Range of Exercise Prices, Upper Range Limit (USD per share)	$ 11
Options on Shares Outstanding		3,370,048	8,011,380	10,094,622
Options on Shares Exercisable	1,703,876
Options Exercisable, Weighted Average Exercise Price (USD per share)	$ 8.92	$ 9.46	$ 9.77
Options Outstanding, Weighted Average Exercise Price (USD per share)	$ 8.92	$ 9.46	$ 9.77	$ 9.62
2005 - expire in 2015
Information about options outstanding and options exercisable by year of grant
Range of Exercise Prices, Lower Range Limit (USD per share)	$ 10
Range of Exercise Prices, Upper Range Limit (USD per share)	$ 11
2006 – expire in 2014
Information about options outstanding and options exercisable by year of grant
Range of Exercise Prices, Lower Range Limit (USD per share)	$ 10
Range of Exercise Prices, Upper Range Limit (USD per share)	$ 10
2007 – expire in 2015
Information about options outstanding and options exercisable by year of grant
Range of Exercise Prices, Lower Range Limit (USD per share)	$ 9
Range of Exercise Prices, Upper Range Limit (USD per share)	$ 10
2008 - expire in 2016
Information about options outstanding and options exercisable by year of grant
Range of Exercise Prices, Lower Range Limit (USD per share)	$ 7
Range of Exercise Prices, Upper Range Limit (USD per share)	$ 10
Stock Options
Information about options outstanding and options exercisable by year of grant
Average Remaining Term	1 year 1 month 14 days
Options on Shares Outstanding	1,703,876
Options on Shares Exercisable	1,703,876
Options Exercisable, Weighted Average Exercise Price (USD per share)	$ 8.92
Options Outstanding, Weighted Average Exercise Price (USD per share)	$ 8.92
Options Outstanding, Aggregate Intrinsic Value	$ 22.9
Options Exercisable, Aggregate Intrinsic Value	22.9
Stock Options \| 2005 - expire in 2015
Information about options outstanding and options exercisable by year of grant
Average Remaining Term	3 months 10 days
Options on Shares Outstanding	33,799
Options on Shares Exercisable	33,799
Options Exercisable, Weighted Average Exercise Price (USD per share)	$ 10.89
Options Outstanding, Weighted Average Exercise Price (USD per share)	$ 10.89
Options Outstanding, Aggregate Intrinsic Value	0.4
Options Exercisable, Aggregate Intrinsic Value	0.4
Stock Options \| 2006 – expire in 2014
Information about options outstanding and options exercisable by year of grant
Average Remaining Term	1 year 4 months 1 day
Options on Shares Outstanding	42,250
Options on Shares Exercisable	42,250
Options Exercisable, Weighted Average Exercise Price (USD per share)	$ 9.96
Options Outstanding, Weighted Average Exercise Price (USD per share)	$ 9.96
Options Outstanding, Aggregate Intrinsic Value	0.5
Options Exercisable, Aggregate Intrinsic Value	0.5
Stock Options \| 2007 – expire in 2015
Information about options outstanding and options exercisable by year of grant
Average Remaining Term	2 months 5 days
Options on Shares Outstanding	190,679
Options on Shares Exercisable	190,679
Options Exercisable, Weighted Average Exercise Price (USD per share)	$ 10.15
Options Outstanding, Weighted Average Exercise Price (USD per share)	$ 10.15
Options Outstanding, Aggregate Intrinsic Value	2.3
Options Exercisable, Aggregate Intrinsic Value	2.3
Stock Options \| 2008 - expire in 2016
Information about options outstanding and options exercisable by year of grant
Average Remaining Term	1 year 3 months 3 days
Options on Shares Outstanding	1,437,148
Options on Shares Exercisable	1,437,148
Options Exercisable, Weighted Average Exercise Price (USD per share)	$ 8.68
Options Outstanding, Weighted Average Exercise Price (USD per share)	$ 8.68
Options Outstanding, Aggregate Intrinsic Value	19.7
Options Exercisable, Aggregate Intrinsic Value	$ 19.7