Equity Arrangements - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended	1 Months Ended	3 Months Ended		12 Months Ended		1 Months Ended					1 Months Ended	3 Months Ended	1 Months Ended				0 Months Ended	1 Months Ended		0 Months Ended	1 Months Ended
	Apr. 25, 2013	Dec. 29, 2012	Mar. 30, 2013	Mar. 31, 2012	Dec. 31, 2011	Nov. 30, 2010	Nov. 30, 2010 Capped call (equity options)	Mar. 30, 2013 Capped call (equity options)	Mar. 30, 2013 Convertible notes payable due in 2018 (junior subordinated)	Dec. 29, 2012 Convertible notes payable due in 2018 (junior subordinated)	Nov. 30, 2010 Convertible notes payable due in 2018 (junior subordinated)	Nov. 30, 2010 Maximum Capped call (equity options)	Mar. 30, 2013 Maximum Capped call (equity options)	Nov. 30, 2010 Minimum Capped call (equity options)	Nov. 30, 2010 Convertible Preferred Units	Mar. 30, 2013 Convertible Preferred Units	Nov. 30, 2010 Convertible Preferred Units On or after December 22, 2015	Apr. 25, 2013 Purchased Call Option [Member]	Nov. 30, 2012 Purchased Call Option [Member]	Mar. 30, 2013 Purchased Call Option [Member]	Apr. 25, 2013 Subsequent Event [Member]	Jan. 31, 2013 Subsequent Event [Member]
Stockholders Equity Note [Line Items]
Forward share purchase contract			$ 350.0	$ 0	$ 350.0																	$ 362.7
Accelerated Share Repurchases, Authorized Amount		850
Payments for Repurchase of Common Stock		850.0	21.1	10.9
Accelerated Share Repurchases, Initial Delivery of Shares Repurchased		9,345,794
Accelerated Share Repurchases, Initial Value of Shares Repurchased		680
Accelerated Share Repurchases, Initial Price Paid Per Share		$ 72.76
Forward Contract Indexed to Issuer's Equity, Settlement Alternatives, Cash, at Fair Value		170
Accelerated Share Repurchases, Final Delivery of Shares Repurchased	1,600,000																				2,200,000
Forward share purchase contract, shares purchased					5,581,400
Long-term debt, including current maturities		3,536.9	3,504.7						632.5	632.5	632.5
Convertible preferred units issued															6,325,000
Convertible preferred units issued, per share															$ 100
Stated interest rate															4.75%
Convertible preferred stock, conversion rate															1.3333	1.3501
Conversion price (in dollars per share)															$ 75.00	$ 74.07
Debt Instrument, Number of Shares of Convertible Preferred Stock to be Delivered, As a Percentage of Purchase Contracts			85.00%
Common stock to be issued up on conversion															8,433,123
Convertible preferred stock, redemption price as a percent of liquidation preference																	100.00%
Convertible preferred stock, liquidation preference per share																	$ 100
Over the counter capped call purchased, maturity period						5 years
Number of common shares purchased under call option							8,433,123											600,000	10,094,144
Option Indexed to Issuer's Equity, Premium Amount																			29.5
Option Indexed to Issuer's Equity, Average Premium Price Per Share																			$ 2.92
Option Indexed to Issuer's Equity, Average Lower Strike Price																			$ 71.43
Option Indexed to Issuer's Equity, Average Upper Strike Price																			$ 79.75
Option Indexed to Issuer's Equity, Aggregate Fair Value																				13.1
Call option, aggregate premium							50.3
Call option, average price (in dollars per share)							$ 5.97
Open option contracts written at fair value								$ 80.3
Strike price (in dollars per share)												$ 97.95	$ 96.73	$ 75.00
Debt Instrument Convertible Conversion Warrant Strike Price, Percentage Higher than Previous Price on November 1, 2010						60.00%