Stock-Based and Other Compensation Plans - Assumptions and Award Activity (Details) - $ / shares	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Stock Option
Assumptions used to value stock option awards [Abstract]
Expected term (in years)	6 years 8 months 12 days	6 years 4 months 24 days	6 years 3 months 18 days
Expected volatility (in hundredths)	33.40%	33.20%	32.40%
Risk-free rate (in hundredths)	2.60%	2.20%	1.60%
Expected dividend yield (in hundredths)	1.20%	0.90%	0.70%
Weighted-average grant-date fair value of options granted (in dollars per share)	$ 10.47	$ 13.26	$ 10.10
Restricted Stock
Assumptions used to value stock option awards [Abstract]
Expected volatility (in hundredths)	35.00%	35.00%	38.00%
Risk-free rate (in hundredths)	2.30%	1.50%	1.00%

No definition available.

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

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