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Capital Stock - Shares Used To Calculate Earnings (Details) - shares
shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Equity [Abstract]        
Basic (shares) 51.1 50.7 51.0 50.7
Effect of dilutive stock options and awards (shares) 0.9 1.2 0.0 0.9
Diluted (shares) 52.0 51.9 51.0 51.6
Antidilutive stock options and awards excluded from denominator (shares) 0.0 0.0 1.6 0.1
Share-based goods and nonemployee services transaction, quantity of securities issued (shares) 0.3 0.3 0.3 0.3