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Earnings Per Share (Reconciliation Of Weighted-Average Shares Used In Earnings Per Share Computations) (Details)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Earnings Per Share [Abstract]    
Weighted-average shares - basic (in shares) 231.9us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 231.3us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Potentially dilutive share options (in shares) 0us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 0.1us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Weighted-average shares - diluted (in shares) 231.9us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 231.4us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Antidilutive share options excluded from computation of diluted earnings per share (in shares) 0.5us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 0.4us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount