Stockholders' Equity (Details) - USD ($) $ / shares in Units, shares in Millions	14 Months Ended
Dec. 31, 2018	Nov. 30, 2017
Equity [Abstract]
Authorized share repurchase program amount		$ 100,000,000.0
Shares repurchased (in shares)	2.3
Average cost of shares repurchased (USD per share)	$ 43.71

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration