Long-Term Incentive Employee Compensation - Share-based Compensation Summary of Stock Options (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding Number	2.7	4.3	8.0	3.7
Options Outstanding Weighted-Average Remaining Contractual Life (In Years)	6 years
Options Outstanding Weighted-Average Exercise Price	$ 20.46	$ 18.46	$ 16.70	$ 85.08
Options Outstanding Aggregate Intrinsic Value	$ 61.4
Options Exercisable Number	1.5	2.9	6.3
Options Exercisable Weighted-Average Remaining Contractual Life (In Years)	4 years 2 months 12 days
Options Exercisable Weighted-Average Exercise Price	$ 18.34	$ 17.10	$ 16.03
Options Exercisable Aggregate Intrinsic Value	38.7
$12 - $15 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Minimum exercise price	$ 12
Maximum exercise price	$ 15
Options Outstanding Number	0.5
Options Outstanding Weighted-Average Remaining Contractual Life (In Years)	1 year 1 month 6 days
Options Outstanding Weighted-Average Exercise Price	$ 13.19
Options Outstanding Aggregate Intrinsic Value	14.0
Options Exercisable Number	0.5
Options Exercisable Weighted-Average Remaining Contractual Life (In Years)	1 year 1 month 6 days
Options Exercisable Weighted-Average Exercise Price	$ 13.19
Options Exercisable Aggregate Intrinsic Value	14.0
$15 - $20 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Minimum exercise price	$ 15
Maximum exercise price	$ 20
Options Outstanding Number	0.4
Options Outstanding Weighted-Average Remaining Contractual Life (In Years)	4 years 6 months
Options Outstanding Weighted-Average Exercise Price	$ 19.92
Options Outstanding Aggregate Intrinsic Value	9.7
Options Exercisable Number	0.4
Options Exercisable Weighted-Average Remaining Contractual Life (In Years)	4 years 6 months
Options Exercisable Weighted-Average Exercise Price	$ 19.92
Options Exercisable Aggregate Intrinsic Value	9.7
$20 - $25 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Minimum exercise price	$ 20
Maximum exercise price	$ 25
Options Outstanding Number	1.4
Options Outstanding Weighted-Average Remaining Contractual Life (In Years)	7 years 1 month 6 days
Options Outstanding Weighted-Average Exercise Price	$ 21.39
Options Outstanding Aggregate Intrinsic Value	31.9
Options Exercisable Number	0.6
Options Exercisable Weighted-Average Remaining Contractual Life (In Years)	6 years 1 month 6 days
Options Exercisable Weighted-Average Exercise Price	$ 20.94
Options Exercisable Aggregate Intrinsic Value	15.0
$25 - $30 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Minimum exercise price	$ 25
Maximum exercise price	$ 30
Options Outstanding Number	0.4
Options Outstanding Weighted-Average Remaining Contractual Life (In Years)	9 years 2 months 12 days
Options Outstanding Weighted-Average Exercise Price	$ 26.82
Options Outstanding Aggregate Intrinsic Value	5.8
Options Exercisable Number	0
Options Exercisable Weighted-Average Exercise Price	$ 0.00
Options Exercisable Aggregate Intrinsic Value	$ 0