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LONG-TERM DEBT (Details)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2011
Notes Payable, due 2014 [Member]
USD ($)
Dec. 31, 2010
Notes Payable, due 2014 [Member]
USD ($)
Dec. 31, 2011
6.875% Senior Notes, due 2019 [Member]
USD ($)
Integer
Dec. 31, 2010
6.875% Senior Notes, due 2019 [Member]
USD ($)
Dec. 31, 2011
6.125% Senior Notes, due 2034 [Member]
USD ($)
Dec. 31, 2010
6.125% Senior Notes, due 2034 [Member]
USD ($)
Dec. 31, 2011
Loan Notes due 2016 [Member]
USD ($)
Dec. 31, 2011
Loan Notes due 2016 [Member]
GBP (£)
Dec. 31, 2010
Loan Notes due 2016 [Member]
USD ($)
Dec. 31, 2011
Senior Notes due 2014 [Member]
USD ($)
Dec. 31, 2010
Senior Notes due 2014 [Member]
USD ($)
Debt Instrument [Line Items]                          
Total long-term debt $ 831.5 $ 510.0 $ 0.2 $ 0.3 $ 309.0 $ 0 $ 249.7 $ 249.7 $ 9.6 £ 6.2 $ 0 $ 263.0 $ 260.0
Less current portion 0.1 0.1                      
Long-term debt, excluding current maturities 831.4 509.9                      
Interest rate on notes (in hundredths)         6.875%   6.125% 6.125% 5.00% 5.00%   5.125% 5.125%
Unamortized discount             0.3 0.3       0.1 0.1
Fair value adjustments         9.0             13.1 10.1
2012 0.1                        
2013 0.1                        
2014 250.0                        
2016 9.6                        
Weighted-average interest rate of long-term debt 6.10% 5.60%                      
Face amount of debt         300.0                
Proceeds from issuance of Long-Term Debt         293.3                
Proceeds used to repay amounts then outstanding under secured revolving credit agreement         45.0                
Number of interest rate swap transactions         3                
Amount of 2019 Notes converted to variable-rate debt         $ 150.0