Accumulated Other Comprehensive Income - Tax Effects on Each Component of Accumulated Other Comprehensive Income Recognized in Statements of Comprehensive Income (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Foreign currency cumulative translation adjustments, Before Tax	$ (78.6)	$ 10.3	$ 55.6	$ (139.6)
Unrealized cash flow hedge (losses) gains, Before Tax	(8.3)	(11.0)	(64.8)	40.7
Reclassification adjustments on foreign currency hedges, Before Tax	(25.8)	(32.7)	(57.5)	(60.7)
Unrealized (losses) gains on securities ,Before Tax		(0.1)	0.4	0.5
Adjustments to prior service cost and unrecognized actuarial assumptions, Before Tax	2.0	3.0	23.4	6.2
Total Other Comprehensive Gain (Loss), Before Tax	(110.7)	(30.5)	(42.9)	(152.9)
Foreign currency cumulative translation adjustments, Tax	0.0	0.0	0.0	0.0
Unrealized cash flow hedge (losses) gains, Tax	(9.1)	2.1	(21.5)	1.4
Reclassification adjustments on foreign currency hedges, Tax	(6.1)	(7.6)	(13.4)	(14.0)
Unrealized (losses) gains on securities, Tax	0.0	0.0	0.0	0.0
Adjustments to prior service cost and unrecognized actuarial assumptions, Tax	0.9	1.5	2.3	0.8
Total Other Comprehensive Gain (Loss), Tax	(14.3)	(4.0)	(32.6)	(11.8)
Foreign currency cumulative translation adjustments, net of tax	(78.6)	10.3	55.6	(139.6)
Unrealized cash flow hedge (losses) gains, net Tax	0.8	(13.1)	(43.3)	39.3
Reclassification adjustments on foreign currency hedges, net of tax	(19.7)	(25.1)	(44.1)	(46.7)
Unrealized (losses) gains on securities, net of tax		(0.1)	0.4	0.5
Adjustments to prior service cost and unrecognized actuarial assumptions, net of tax	1.1	1.5	21.1	5.4
Total Other Comprehensive Loss, net of tax	$ (96.4)	$ (26.5)	$ (10.3)	$ (141.1)