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Earnings Per Share (Details) - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Weighted Average Number of Shares Outstanding Basic and Diluted [Line Items]
Common stock, shares, outstanding	94,942,565	96,445,488	102,700,000
Repurchased and retired common stock	2,690,292	7,849,154	5,993,959
Treasury Stock, Shares, Acquired	200,000	500,000	600,000
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Weighted-average number of common shares outstanding - basic	94,900,000	99,500,000	104,800,000
Adjusted weighted average shares and assumed conversions - diluted	96,100,000	101,000,000.0	107,000,000.0
Potentially dilutive shares excluded from computation of dilutive earnings per share	7,100,000	4,700,000	4,000,000.0
Stock options
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Incremental common shares attributable to share-based payment arrangements	100,000	500,000	1,000,000.0
Restricted stock units
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Incremental common shares attributable to share-based payment arrangements	1,100,000	1,000,000.0	1,200,000

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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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