Accumulated Other Comprehensive Income - Changes in Components of Other Comprehensive Income, Net of Tax (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Other Comprehensive Income Loss [Line Items]
Cash Flow Hedges, OCI before reclassifications	$ 29.2	$ 4.1
Cash Flow Hedges, Reclassifications	3.9	0.9
Unrealized Gain on Securities, OCI before reclassifications	(0.1)	0.2
Defined Benefit Plan Items, Reclassifications	4.2	22.9
Defined Benefit Plan Items [Member]
Other Comprehensive Income Loss [Line Items]
Defined Benefit Plan Items, Beginning Balance	(106.1)
Defined Benefit Plan Items, OCI before reclassifications
Defined Benefit Plan Items, Reclassifications	4.2
Defined Benefit Plan Items, Ending Balance	(101.9)
Unrealized Losses on Securities [Member]
Other Comprehensive Income Loss [Line Items]
Unrealized Gain on Securities, Beginning Balance	0.4
Unrealized Gain on Securities, OCI before reclassifications	(0.1)
Unrealized Gain on Securities, Reclassifications
Unrealized Gain on Securities, Ending Balance	0.3
Cash Flow Hedges [Member]
Other Comprehensive Income Loss [Line Items]
Cash Flow Hedges, Beginning Balance	4.1
Cash Flow Hedges, OCI before reclassifications	29.2
Cash Flow Hedges, Reclassifications	3.9
Cash Flow Hedges, Ending Balance	37.2
Foreign Currency Translation [Member]
Other Comprehensive Income Loss [Line Items]
Foreign Currency Translation, Beginning Balance	445.5
Foreign Currency Translation, OCI before reclassifications	(65.0)
Foreign Currency Translation, Reclassifications
Foreign Currency Translation, Ending Balance	$ 380.5