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Debt (Narratives) (Details)
In Millions, unless otherwise specified
12 Months Ended 7 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 12 Months Ended
Sep. 30, 2014
USD ($)
Sep. 30, 2013
USD ($)
Sep. 30, 2012
USD ($)
Sep. 30, 2014
Eurobond 3.875%
USD ($)
Sep. 30, 2014
Eurobond 3.875%
EUR (€)
Apr. 30, 2013
Revolving Credit Facility [Member]
Credit Agreement 2013 Member [Member]
Sep. 30, 2014
Revolving Credit Facility [Member]
Credit Agreement 2013 Member [Member]
USD ($)
Jun. 30, 2014
Revolving Credit Facility [Member]
Credit Agreement 2013 Member [Member]
USD ($)
Sep. 30, 2014
Revolving Credit Facility [Member]
Credit Agreement 2013 Member [Member]
Maximum [Member]
Sep. 30, 2014
Foreign Subsidiary Facility [Member]
USD ($)
Mar. 20, 2014
Chinese Renminbi (RMB) Syndicated Credit Facility [Member]
USD ($)
Mar. 20, 2014
Chinese Renminbi (RMB) Syndicated Credit Facility [Member]
CNY
Sep. 30, 2014
Chinese Renminbi (RMB) Syndicated Credit Facility [Member]
USD ($)
Sep. 30, 2014
Chinese Renminbi (RMB) Syndicated Credit Facility [Member]
CNY
Sep. 30, 2014
Senior Note 3.35%
USD ($)
Sep. 30, 2013
Senior Note 3.35%
USD ($)
Sep. 30, 2014
Commercial Paper [Member]
Debt Instruments [Abstract]                                  
Short-term debt, weighted average interest rate 1.50% 1.80%                              
Cash paid for interest, net of amounts capitalized $ 132.4 $ 136.1 $ 127.6                            
Debt Instrument [Line Items]                                  
Debt instrument, issuance date                             Jul. 31, 2014    
Debt instrument, maturity date                             Jul. 31, 2024    
Senior Notes                             400.0 0  
Interest rate of debt, stated percentage       3.875% 3.875%                   3.35%    
Amount classified as long-term debt based on ability and intent to refinance       378.9 300.0                        
Debt instrument, maturity year                             2024   2014
Credit facility, initiation date             Apr. 30, 2013           Jun. 11, 2012 Jun. 11, 2012      
Credit facility, length credit agreement in years           5 years                      
Credit facility, maximum borrowing capacity             2,500.0 2,595.0   189.7     160.9 1,000.0      
Credit facility, expiration date             Apr. 30, 2018           Mar. 20, 2014 Mar. 20, 2014      
Debt instrument, expiration, month year       March 2015 March 2015                        
Covenant, ratio of total debt to total capitalization                 70.00%                
Credit facility, amount borrowed and outstanding             0     180.6              
Repayment outstanding balance                     $ 40.2 250.0