Stockholders' Equity - Registered Underwritten Public Offerings (Details) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
Sep. 21, 2016	Dec. 31, 2016
Equity [Abstract]
Issuance of stock (in shares)	48,787,878
Price of shares issued (in dollars per share)	$ 8.25
Issuance of stock	$ 402.5	$ 402.5
Issuance costs	$ 11.9	$ 11.9

Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.

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