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Shareholders' Equity - Narrative (Details) - USD ($)	1 Months Ended
	Mar. 31, 2017	Jun. 30, 2018
Stockholders' Equity Note [Abstract]
Authorized amount in buyback program	$ 250,000,000.0
Shares authorized to be repurchased (in shares)	17,300,000.0
Period to complete share repurchase program	3 years
Remaining authorized shares amount		$ 209,900,000

X

- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

+ Details

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X

- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

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X

- Definition

Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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X

- Definition

Amount remaining of a stock repurchase plan authorized.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- References

No definition available.

+ Details

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