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Capital Stock - Shares Used To Calculate Earnings (Details)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]        
Basic 49.0 48.6 49.0 48.6
Effect of dilutive stock awards 0.4 0.3 0 0.3
Diluted 49.4 48.9 49.0 48.9
Antidilutive stock options and awards excluded from denominator 1.0 1.9 2.1 1.9
Deferred compensation common stock unit 0.6 0.6 0.5 0.6