Changes in Accumulated Other Comprehensive Income by Component (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Schedule of Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, gains and losses on cash flow hedges	$ (27.2)	[1]
Amounts recorded in AOCI, gains and losses on cash flow hedges	14.9	[1]
Amounts reclassified out of AOCI, gains and losses on cash flow hedges	(12.8)	[1],[2]
Net current period OCI, gains and losses on cash flow hedges	2.1	[1]	(1.0)
Ending balance, gains and losses on cash flow hedges	(25.1)	[1]
Beginning balance, unrealized gains and losses on available-for-sales securities	6.6	[1]
Amounts recorded in AOCI, unrealized gains and losses on available-for-sales securities	(0.2)	[1]
Amounts reclassified out of AOCI, unrealized gains and losses on available-for-sales securities		[1]
Net current period OCI, unrealized gains and losses on available-for-sales securities	(0.2)	[1]	0.3
Ending balance, unrealized gains and losses on available-for-sales securities	6.4	[1]
Beginning balance, defined benefit pension plans	(496.5)	[1]
Amounts recorded in AOCI, defined benefit pension plans	7.3	[1]
Amounts reclassified out of AOCI, defined benefit pension plans	7.3	[1],[2]
Net current period OCI, defined benefit pension plans	14.6	[1]	4.5
Ending balance, defined benefit pension plans	(481.9)	[1]
Beginning balance, foreign currency translation	357.6	[1]
Amounts recorded in AOCI, foreign currency translation	(96.0)	[1]	91.3
Amounts reclassified out of AOCI, foreign currency translation		[1]
Net current period OCI, foreign currency translation	(96.0)	[1]
Ending balance, foreign currency translation	261.6	[1]
Beginning balance	(159.5)	[1],[3]
Amounts recorded in AOCI	(74.0)	[1]
Amounts reclassified out of AOCI	(5.5)	[1],[2]
Net current period OCI	(79.5)	[1]
Ending balance	$ (239.0)	[1]

[1] All amounts are net of tax. Amounts in parentheses indicate reductions in the AOCI component of stockholders' equity.

[2] Amounts in parentheses indicate reductions in expenses in the Consolidated Statements of Comprehensive Income. Amounts without parenthesis indicate expenses in the Consolidated Statements of Comprehensive Income.

[3] The December 31, 2012 consolidated balance sheet has been derived from audited financial statements.