Hedging Activities Derivative Instruments and Credit Risk - Additional Information (Detail) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 USD ($) Y	Dec. 31, 2012 EUR (€)	Dec. 31, 2011 USD ($)	Dec. 31, 2011 EUR (€)	Dec. 31, 2012 Minimum	Dec. 31, 2012 Maximum
Derivatives, Fair Value [Line Items]
Borrowings resulting in interest rate risk	$ 369.2
Foreign currency contracts maturity period, years	1	1
Number of fixed rate payor on interest rate swap contracts	7	7
Variable rate borrowings	200.0
Variable interest rate, lower range	0.30%	0.30%
Variable interest rate, higher range	2.20%	2.20%
Expiration dates					2013	2014
Expected reclassification of losses out of AOCI into earnings during the next 12 months	0.4
Variable rate borrowings outstanding	321.6	22.5
Number of foreign currency forward contracts outstanding	28	28
Notional amounts, lower range	0.1
Notional amounts, higher range	61.1
Net losses from foreign currency forward contracts	1.1		2.0
Total net foreign currency gains (losses)	3.4		0.7
Portion of EURO Term Loan designated as net investment hedge		22.5		37.6
Amount of gain recognized in other comprehensive income	(0.5)		2.8
Net balances of term loan designated as hedge included in accumulated other comprehensive income net of tax	$ (2.8)		$ (2.3)