Earnings Per Share (Details) - shares	3 Months Ended	6 Months Ended
Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Weighted Average Number of Shares Outstanding Basic and Diluted [Line Items]
Common Stock, Shares, Outstanding	99,100,000		104,600,000		99,100,000	104,600,000
Stock Repurchased and Retired During Period, Shares	3,443,914	1,260,163	3,272,480	760,473	4,700,000	4,100,000
Treasury Stock, Shares, Acquired					500,000	600,000
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Weighted-average number of common shares outstanding - basic	101,300,000		106,100,000		101,800,000	106,400,000
Weighted-average number of common shares outstanding - diluted	102,200,000		108,000,000.0		103,300,000	109,000,000.0
Potentially dilutive shares excluded from computation of dilutive earnings per share	5,600,000		3,800,000		4,500,000	3,500,000
Stock options
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Incremental Common Shares Attributable to Share-based Payment Arrangements	300,000		1,100,000		400,000	1,200,000
Restricted stock units
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Incremental Common Shares Attributable to Share-based Payment Arrangements	600,000		800,000		1,100,000	1,400,000

Weighted Average Number of Shares Outstanding Basic and Diluted [Line Items]

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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Number of shares that have been repurchased and retired during the period.

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Number of shares that have been repurchased during the period and are being held in treasury.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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