Debt - Debt (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Long-term debt	$ 6,351.1	$ 6,433.3
Less: Current portion	177.2	176.2
Total long-term debt	6,173.9	6,257.1
$450.0 million 5.00% notes due August 14, 2014 [Member]
Debt Instrument [Line Items]
Carrying value of notes	450.0	450.0
$1,200.0 million 1.875% notes due October 1, 2017 [Member]
Debt Instrument [Line Items]
Carrying value of notes	1,200.0	1,200.0
$400.0 million 6.125% notes due August 14, 2019 [Member]
Debt Instrument [Line Items]
Carrying value of notes	400.0	400.0
$1,700.0 million 3.250% notes due October 1, 2022 [Member]
Debt Instrument [Line Items]
Carrying value of notes	1,700.0	1,700.0
$1,000.0 million 4.625% notes due October 1, 2042 [Member]
Debt Instrument [Line Items]
Carrying value of notes	1,000.0	1,000.0
Senior Notes [Member]
Debt Instrument [Line Items]
Less: Unamortized discount	(33.7)	(35.1)
Total long-term debt	4,716.3	4,714.9
Term Loan Credit Agreement [Member]
Debt Instrument [Line Items]
Long-term debt	1,615.0	1,700.0
Other, including capital leases [Member]
Debt Instrument [Line Items]
Long-term debt	$ 19.8	$ 18.4