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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Earnings Per Share - Narrative (Details) - shares shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Number of shares outstanding	137.5	142.6	137.5	142.6	139.1	140.5	140.5	142.5	144.9
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of options excluded from the computation of diluted earnings per share	0.0	0.3	0.1	0.2