Stock-Based Compensation - Stock-Based Compensation Accounting (Details) - Stock Options - $ / shares	3 Months Ended	6 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Stock-Based Compensation Accounting
Weighted average fair value (in dollars per share)	$ 27.85	$ 26.80	$ 33.11	$ 31.54
Risk-free interest rate (as a percent)			1.50%	2.80%
Expected dividend yield (as a percent)			0.00%	0.00%
Expected life (in years)			4 years 6 months	4 years 7 months 6 days
Expected volatility factor (as a percent)			26.80%	26.60%

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 award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents 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
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-Paragraph 2
-Subparagraph (f)(2)(i)
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-Name Accounting Standards Codification
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-SubTopic 10
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