Hedging Activities and Fair Value Measurements - Additional Information (Detail) In Millions, unless otherwise specified	6 Months Ended		12 Months Ended
	Jun. 30, 2012 USD ($) Year	Jun. 30, 2012 EUR (€)	Dec. 31, 2011 EUR (€)
Derivatives, Fair Value [Line Items]
Borrowings resulting in interest rate risk	$ 499.6
Foreign currency contracts maturity period, years	1	1
Variable rate borrowings	75.0
Variable interest rate, lower range	0.50%	0.50%
Variable interest rate, higher range	2.20%	2.20%
Expiration dates	2013	2013
Expected reclassification of losses out of AOCI into earnings during the next 12 months	0.5
Variable rate borrowings outstanding	444.8	33.0
Number of foreign currency forward contracts outstanding	39	39
Notional amounts, lower range	0.1
Notional amounts, higher range	16.4
Portion of EURO Term Loan designated as net investment hedge		€ 33.0	€ 37.6