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Debt (Narratives) (Details)
In Millions, unless otherwise specified
12 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 9 Months Ended
Sep. 30, 2012
USD ($)
Sep. 30, 2011
USD ($)
Sep. 30, 2010
USD ($)
Jul. 03, 2012
Indura [Member]
USD ($)
Jul. 03, 2012
Indura [Member]
CLP
Sep. 30, 2012
Multicurrency Facility [Member]
USD ($)
Sep. 30, 2012
Foreign Subsidiary Facility [Member]
USD ($)
Nov. 03, 2011
Note 3.0%
USD ($)
Sep. 30, 2012
Note 3.0%
USD ($)
Sep. 30, 2011
Note 3.0%
USD ($)
Sep. 13, 2012
Senior Fixed rate 1.2%
USD ($)
Sep. 30, 2012
Senior Fixed rate 1.2%
USD ($)
Sep. 30, 2011
Senior Fixed rate 1.2%
USD ($)
Aug. 02, 2012
Chilean Peso Facility [Member]
USD ($)
Aug. 02, 2012
Chilean Peso Facility [Member]
CLP
Jul. 03, 2012
Chilean Peso Facility [Member]
USD ($)
Jul. 03, 2012
Chilean Peso Facility [Member]
CLP
Jun. 11, 2012
Renminbi Credit Facility [Member]
USD ($)
Jun. 11, 2012
Renminbi Credit Facility [Member]
CNY
Sep. 30, 2012
Renminbi Credit Facility [Member]
USD ($)
Sep. 30, 2012
Renminbi Credit Facility [Member]
CNY
Sep. 30, 2012
Senior Notes Four Point One Five Percent [Member]
USD ($)
Sep. 30, 2011
Senior Notes Four Point One Five Percent [Member]
USD ($)
Debt Instruments [Abstract]                                              
Short-term debt, weighted average interest rate 1.50% 2.50%                                          
Cash paid for interest, net of amounts capitalized $ 127.6 $ 117.4 $ 126.9                                        
Debt Instrument [Line Items]                                              
Debt instrument, issuance date               Nov. 03, 2011     Sep. 13, 2012                        
Senior Notes               400.0 400.0 0 400.0 400.0 0                 300.0 300.0
Interest rate of debt, stated percentage               3.00% 3.00%   1.20% 1.20%                   4.15%  
Debt instrument, maturity date               Nov. 03, 2021     Oct. 15, 2017                        
Committed credit facility           2,170.0 400.0                 778.0 390,000.0 158.7 1,000.0        
Line of credit facility, expiration date           Jun. 30, 2015                                  
Line of credit facility, expiration date                                   June 2015 June 2015        
Financial covenant, ratio of long-term debt to equity maximum           60.00%                                  
Amount borrowed and outstanding           0 387.0             0 0 693.0 347,000.0     31.7 200.0    
Business Acquisition [Line Items]                                              
Cash consideration       690.0 345,500.0                                    
Acquired debt       $ 227 113,800