Stock and Incentive Programs for Employees and Directors - Schedule of Stock Option Activity (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Shares Under Option
Outstanding at beginning of period	3,707
Exercised	(85)
Cancelled/forfeited/expired	(3)
Equitable adjustment	(2,068)
Outstanding at end of period	1,551	3,707
Vested and exercisable at end of period	1,551
Weighted Average Exercise Price
Outstanding at beginning of period	$ 19.66
Exercised	13.23
Cancelled/forfeited/expired	15.77
Equitable adjustment	28.50
Outstanding at end of period	37.19	$ 19.66
Vested and exercisable at end of period	$ 37.19
Weighted Average Remaining Contractual Term (years)
Outstanding	2 years 2 months 12 days	3 years 7 months 6 days
Vested and exercisable at end of period	2 years 2 months 12 days
Aggregate Intrinsic Value
Outstanding at beginning of period	$ 8.4
Outstanding at end of period	1.7	$ 8.4
Vested and exercisable at end of period	$ 1.7