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Name:	us-gaap_SubsidiarySaleOfStockLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Stockholders' Equity - Shelf Registration Statement (Details) - USD ($) $ in Millions	Nov. 02, 2018	Jun. 19, 2015
2015 Shelf Offering
Sale of stock
Aggregate amount of securities issuable		$ 150.0
2018 Shelf Offering
Sale of stock
Aggregate amount of securities issuable	$ 100.0