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Earnings per Share (Details) - shares
shares in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Earnings Per Share [Abstract]    
Basic weighted-average shares outstanding (in shares) 142.7 147.0
Effect of dilutive securities (in shares) 2.2 2.2
Diluted weighted-average shares outstanding (in shares) 144.9 149.2
Anti-dilutive shares (fewer than) (in shares) 0.1 0.1