Debt - Additional Information (Detail) In Millions, unless otherwise specified	1 Months Ended			3 Months Ended	9 Months Ended			9 Months Ended		1 Months Ended		3 Months Ended	1 Months Ended
	Jun. 30, 2013 USD ($)	Jan. 31, 2013 USD ($)	Jan. 31, 2013 EUR (€)	Sep. 30, 2013 USD ($)	Sep. 30, 2013 USD ($)	Sep. 30, 2013 1.75% Notes, Due 2018	Jun. 30, 2013 1.75% Notes, Due 2018 USD ($)	Sep. 30, 2013 3.25% Notes, Due 2023	Jun. 30, 2013 3.25% Notes, Due 2023 USD ($)	Jul. 31, 2013 6.375% Notes, Due 2014 USD ($)	Jun. 30, 2013 6.375% Notes, Due 2014 USD ($)	Sep. 30, 2013 6.375% Notes, Due 2014 USD ($)	Jun. 30, 2013 5.875% Notes, Due 2036 USD ($)	Sep. 30, 2013 5.875% Notes, Due 2036
Debt Instrument [Line Items]
Notes principal amount							$ 250		$ 250
Notes interest rate						1.75%	1.75%	3.25%	3.25%	6.375%		6.375%		5.875%
Notes due date						Jun. 15, 2018		Jun. 15, 2023
Repayments of notes principal amount	236.8	296.9	218.8							248.0	78.4		138.2
Loss on early extinguishment of debt	(43.1)			(13.8)	(56.9)							(13.8)
Premiums and other related costs	$ 41.9