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Income Taxes - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation Of Unrecognized Tax Benefits [Line Items]
Unrecognized tax benefits - January 1	$ 198.7	$ 203.4	$ 183.5
Additions for:
Prior year tax positions	48.4	1.5	17.0
Current year tax positions	0.8	15.1	48.1
Assumed in acquisition	3.8		4.8
Reductions for:
Prior year tax positions	(4.8)	(21.2)	(38.0)
Settlements	(33.6)		(12.0)
Lapse of statute	(4.6)	(0.1)
Unrecognized tax benefits - December 31	$ 208.8	$ 198.7	$ 203.4

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Reconciliation uncertain tax position purchase accounting.

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The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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The gross amount of decreases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns.

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The gross amount of decreases in unrecognized tax benefits resulting from settlements with taxing authorities.

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The gross amount of increases in unrecognized tax benefits resulting from tax positions that have been or will be taken in the tax return for the current period, excluding amounts pertaining to examined tax returns.

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The gross amount of decreases in unrecognized tax benefits resulting from lapses of the applicable statutes of limitations.

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