(Loss) Income Per Share of Common Stock - Schedule of Potentially Dilutive Securities Excluded from Computation (Details) - shares shares in Millions	1 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Nov. 30, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities (in shares)	1.3	1.8	8.7	12.8
Employee stock options and stock purchase plan
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities (in shares)	0.0	0.1	0.0	0.2
Unvested restricted shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities (in shares)	1.3	1.6	1.6	1.6
4 1/16% Debentures
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive securities (in shares)	0.0	0.1	7.1	11.0
Debt instrument interest rate stated percentage		4.0625%