Reconciliation of Restructuring Liability (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period	$ 10.7	$ 22.7
Provision	2.2	1.9
Cash payments	(3.9)	(13.1)
Foreign currency and other non-cash changes	0.5	(1.3)
Balance at end of period	9.5	10.2
Workforce Restructurings
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period	7.5	12.8
Provision	2.2	(0.1)
Cash payments	(3.7)	(5.3)
Foreign currency and other non-cash changes	0.6	(0.8)
Balance at end of period	6.6	6.6
Lease/Contract Terminations
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period	3.2	9.9
Provision		2.0
Cash payments	(0.2)	(7.8)
Foreign currency and other non-cash changes	(0.1)	(0.5)
Balance at end of period	$ 2.9	$ 3.6