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Capital Stock - Shares Used To Calculate Earnings (Details) - shares
shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Equity [Abstract]        
Basic (shares) 50.4 50.3 50.6 50.2
Effect of dilutive stock options and awards (shares) 0.0 0.8 0.0 0.8
Diluted (shares) 50.4 51.1 50.6 51.0
Antidilutive stock options and awards excluded from denominator (shares) 1.5 0.1 1.5 0.1
Deferred compensation common stock unit (shares) 0.3 0.3 0.3 0.3