Changes in Accumulated Other Comprehensive Income (Loss) by Component (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (579.8)	$ 8.7	$ (159.5)
Recorded into AOCI	(442.5)	(584.4)	164.3
Reclassified out of AOCI	5.3	(4.1)	3.9
Net other comprehensive (loss) income	(437.2)	(588.5)	168.2
Ending balance	(1,017.0)	(579.8)	8.7
Derivative Contracts
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(13.5)	(15.1)	(27.2)
Recorded into AOCI	27.9	20.0	36.9
Reclassified out of AOCI	(20.8)	(18.4)	(24.8)
Net other comprehensive (loss) income	7.1	1.6	12.1
Ending balance	(6.4)	(13.5)	(15.1)
Marketable Debt Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	5.3	1.7	6.6
Recorded into AOCI	(1.7)	4.2	(6.1)
Reclassified out of AOCI	(1.5)	(0.6)	1.2
Net other comprehensive (loss) income	(3.2)	3.6	(4.9)
Ending balance	2.1	5.3	1.7
Pension Plan
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(433.1)	(262.2)	(496.5)
Recorded into AOCI	15.1	(185.8)	204.8
Reclassified out of AOCI	27.6	14.9	29.5
Net other comprehensive (loss) income	42.7	(170.9)	234.3
Ending balance	(390.4)	(433.1)	(262.2)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(138.5)	284.3	357.6
Recorded into AOCI	(483.8)	(422.8)	(71.3)
Reclassified out of AOCI			(2.0)
Net other comprehensive (loss) income	(483.8)	(422.8)	(73.3)
Ending balance	$ (622.3)	$ (138.5)	$ 284.3