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Earnings per Share (Details) - shares
shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Earnings Per Share [Abstract]        
Basic weighted-average shares outstanding (in shares) 144.5 150.9 145.7 151.6
Effect of dilutive securities 2.7 2.8 2.5 2.5
Diluted weighted-average shares outstanding (in shares) 147.2 153.7 148.2 154.1
Anti-dilutive shares (fewer than) (in shares) 0.1 0.1 0.1 0.1