Stockholders' Deficit (Tables)

9 Months Ended

Sep. 30, 2018

Equity [Abstract]

Class of Treasury Stock

A summary of shares repurchased under the 2015 Repurchase Program, during the three and nine months ended September 30, 2018 and cumulatively, is as follows:

2015 Repurchase Program	Shares	Cost of shares
		(In millions)
Repurchased during the three months ended September 30, 2018	107,814	$	7.9
Repurchased during the nine months ended September 30, 2018	383,615	$	27.9
Cumulative (life-of-program) repurchases as of September 30, 2018	1,384,272	$	110.8
Remaining dollar value of shares that may be repurchased	n/a	$	39.2