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Description Of The Business And Summary Of Significant Accounting Policies (Reconciliation Of The Weighted-Average Shares Used In Basic And Diluted Earnings Per Share Computations) (Details) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Description Of The Business And Summary Of Significant Accounting Policies [Abstract]
Weighted-average shares - basic	231.6us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	230.9us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	229.4us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Potentially dilutive share options	0us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	0.2us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	0.3us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Weighted-average shares - diluted	231.6us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	231.1us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	229.7us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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- Definition

The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 16

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Weighted-Average Number of Common Shares Outstanding

-URI http://asc.fasb.org/extlink&oid=6528421

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