Long-Term Debt and Other Financing Arrangements - Pubic Offering of Common Stock (Details) - Subsequent Event $ / shares in Units, shares in Millions, $ in Millions	Oct. 05, 2017 USD ($) $ / shares shares
Subsidiary, Sale of Stock [Line Items]
Sale of stock, consideration received on transaction | $	$ 114.8
2017 GARA
Subsidiary, Sale of Stock [Line Items]
Required equity proceeds to be raised per terms of agreement by specified period | $	$ 114.0
Percentage of proceeds to be deposited	80.00%
Over-Allotment Option
Subsidiary, Sale of Stock [Line Items]
Sale of stock, number of shares issued in transaction (in shares) | shares	73.4
Purchase price per share (USD per shares) | $ / shares	$ 1.65
Sale of stock, option period to purchase additional shares in transaction	30 days
Sale of stock, number of additional shares available for purchase in transaction (in shares) | shares	11.0