Basis of Presentation (Details) - ASU 2016-09 $ in Millions	6 Months Ended
Jun. 30, 2017 USD ($)
Recently Issued Accounting Standards
Cumulative effect on retained earnings, Net of tax	$ (5.8)
Cumulative effect on retained earnings, Tax	$ (3.2)

Amount of the cumulative effect on retained earnings net of related income tax effect.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22663-107794

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Amount of the related income tax effect of a cumulative effect on retained earnings.

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No definition available.

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