Long-Term Debt and Other Financing Arrangements - 8.00% Convertible Senior Notes Issued in 2013 (Details) - 8.00% Convertible Senior Notes Issued in 2013 $ / shares in Units, shares in Millions, $ in Millions	66 Months Ended
	Jun. 30, 2019 USD ($) day shares	Dec. 31, 2013 $ / shares	May 20, 2013
Debt Instrument [Line Items]
Loan interest rate, percentage	8.00%	8.00%	8.00%
Loan agreement, conversion price (USD per share) | $ / shares		$ 0.69
Interest rate, payable in cash, percentage		5.75%
Interest rate, payable in additional notes, percentage		2.25%
Debt conversion, threshold of consecutive trading days | day	40
Debt conversion, converted instrument, amount | $	$ 55.4
Debt conversion, converted instrument, shares issued (in shares) | shares	98.5