Changes in Accumulated Other Comprehensive Income by Component (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014		Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			$ 8.7	[1]	$ (159.5)
Recorded into AOCI			24.1		(118.2)
Reclassified out of AOCI			30.7		(32.2)
Net other comprehensive income (loss)	49.5	(70.9)	54.8		(150.4)
Ending balance	63.5	(309.9)	63.5		(309.9)
Derivative Contracts
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			(15.1)		(27.2)
Recorded into AOCI			(22.7)		54.1
Reclassified out of AOCI			23.3		(44.9)
Net other comprehensive income (loss)			0.6		9.2
Ending balance	(14.5)	(18.0)	(14.5)		(18.0)
Marketable Debt Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			1.7		6.6
Recorded into AOCI			2.8		(4.2)
Reclassified out of AOCI			(0.1)
Net other comprehensive income (loss)			2.7		(4.2)
Ending balance	4.4	2.4	4.4		2.4
Pension Plan
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			(262.2)		(496.5)
Recorded into AOCI			(2.6)		8.5
Reclassified out of AOCI			7.5		14.7
Net other comprehensive income (loss)			4.9		23.2
Ending balance	(257.3)	(473.3)	(257.3)		(473.3)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			284.3		357.6
Recorded into AOCI			46.6		(176.6)
Reclassified out of AOCI					(2.0)
Net other comprehensive income (loss)			46.6		(178.6)
Ending balance	$ 330.9	$ 179.0	$ 330.9		$ 179.0

[1] The December 31, 2013 consolidated balance sheet has been derived from audited financial statements.