DEBT - Additional Information (Detail) (USD $) In Millions	6 Months Ended			6 Months Ended		6 Months Ended		6 Months Ended		3 Months Ended
	Jun. 30, 2011	Jun. 30, 2011 Senior Credit Facility Due August 2012	Dec. 31, 2010 Senior Credit Facility Due August 2012	Jun. 30, 2011 Private Placement Notes 5.64 Percent, Due In 2015	Dec. 31, 2010 Private Placement Notes 5.64 Percent, Due In 2015	Jun. 30, 2011 Private Placement Notes 3.89 Percent, due in 2017	Dec. 31, 2010 Private Placement Notes 3.89 Percent, due in 2017	Jun. 30, 2011 Private Placement Notes 4.47 Percent, due in 2020	Dec. 31, 2010 Private Placement Notes 4.47 Percent, due in 2020	Jun. 30, 2011 Term Loan	Dec. 31, 2010 Term Loan
Bank loan guaranteed on behalf of Shiraishi	$ 6.2
Long-term debt, face amount				100.0	100.0	175.0	175.0	225.0	225.0	215.0	215.0
Long-term debt, borrowing capacity		850.0	850.0
Debt, maturity date	May 2012	August 2012		April 2015		October 2017		October 2020
Notes Receivable extended to Shiraishi	15.2
Repayment of outstanding principal										76.9
Unamortized term loan fee recognized										1.2
Senior letters of credit facility, committed to outstanding letters of credit		165.7	184.0
Senior letters of credit facility, unused portion		$ 297.1	$ 490.6