Stock and Incentive Programs for Employees and Directors - Schedule of Stock Option Activity (Detail) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Shares Under Option
Outstanding at beginning of period	4,139
Exercised	(149)
Cancelled/forfeited/expired	(143)
Outstanding at end of period	3,847	4,139
Vested and expected to vest at end of period	3,825
Exercisable at end of period	1,357
Weighted Average Exercise Price
Outstanding at beginning of period	$ 19.39
Exercised	$ 10.98
Cancelled/forfeited/expired	$ 27.25
Outstanding at end of period	$ 19.43	$ 19.39
Vested and expected to vest at end of period	$ 19.46
Exercisable at end of period	$ 8.93
Weighted Average Remaining Contractual Term (years)
Outstanding	4 years 8 months 12 days	5 years 7 months 6 days
Vested and expected to vest at end of period	4 years 8 months 12 days
Exercisable at end of period	5 years 1 month 6 days
Aggregate Intrinsic Value
Outstanding at beginning of period	$ 21.2
Outstanding at end of period	12.6	21.2
Vested and expected to vest at end of period	12.5
Exercisable at end of period	$ 10.7