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Commitments and Contingencies - Schedule of Expected Settlement Payment (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Payment Of Commitment And Contingencies [Line Items]
Fines, penalties and disgorgements	$ 40.2
Fees and associated expenses	3.9
Less discounting to fair value	0
Government investigations and other matters Expenses, Total	44.1
Amounts paid	(39.5)
Exchange effect	0
Expected total amounts paid	4.6
Due within one year	(4.6)
Total long term amount	0
Government Authorities [Member]
Payment Of Commitment And Contingencies [Line Items]
Fines, penalties and disgorgements	40.2
Fees and associated expenses	0
Less discounting to fair value	0
Government investigations and other matters Expenses, Total	40.2
Amounts paid	(36.5)
Exchange effect	0
Expected total amounts paid	3.7
Due within one year	(3.7)
Total long term amount	0
Compliance Monitor [Member]
Payment Of Commitment And Contingencies [Line Items]
Fines, penalties and disgorgements	0
Fees and associated expenses	3.9
Less discounting to fair value	0
Government investigations and other matters Expenses, Total	3.9
Amounts paid	(3.0)
Exchange effect	0
Expected total amounts paid	0.9
Due within one year	(0.9)
Total long term amount	$ 0