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Capital Stock - Shares Used To Calculate Earnings (Details) - shares
shares in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Equity [Abstract]      
Basic (shares) 50.9 50.7 50.0
Effect of dilutive stock awards (shares) 0.0 1.1 0.6
Diluted (shares) 50.9 51.8 50.6
Antidilutive stock options and awards excluded from denominator (shares) 1.6 0.1 0.1
Deferred compensation common stock unit (shares) 0.3 0.3 0.5