Changes in Accumulated Other Comprehensive Income (Loss) by Component (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 6,940.4	$ 6,753.2
Recorded into AOCI	(129.2)	(442.5)	$ (584.4)
Reclassified out of AOCI	18.1	5.3	(4.1)
Net other comprehensive income (loss)	(111.1)	(437.2)	(588.5)
Ending balance	6,777.6	6,940.4	6,753.2
Derivative Contracts
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(6.4)	(13.5)	(15.1)
Recorded into AOCI	0.2	27.9	20.0
Reclassified out of AOCI	1.9	(20.8)	(18.4)
Net other comprehensive income (loss)	2.1	7.1	1.6
Ending balance	(4.3)	(6.4)	(13.5)
Marketable Debt Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	2.1	5.3	1.7
Recorded into AOCI	0.3	(1.7)	4.2
Reclassified out of AOCI	(2.7)	(1.5)	(0.6)
Net other comprehensive income (loss)	(2.4)	(3.2)	3.6
Ending balance	(0.3)	2.1	5.3
Pension Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(390.4)	(433.1)	(262.2)
Recorded into AOCI	(42.6)	15.1	(185.8)
Reclassified out of AOCI	18.9	27.6	14.9
Net other comprehensive income (loss)	(23.7)	42.7	(170.9)
Ending balance	(414.1)	(390.4)	(433.1)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(622.3)	(138.5)	284.3
Recorded into AOCI	(87.1)	(483.8)	(422.8)
Reclassified out of AOCI	0.0	0.0	0.0
Net other comprehensive income (loss)	(87.1)	(483.8)	(422.8)
Ending balance	(709.4)	(622.3)	(138.5)
ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME:
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(1,017.0)	(579.8)	8.7
Ending balance	$ (1,128.1)	$ (1,017.0)	$ (579.8)