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Debt (Narratives) (Details)
$ / shares in Units, € in Millions, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
$ / shares
Sep. 30, 2015
CLF
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
[1]
Mar. 31, 2016
USD ($)
[1]
Dec. 31, 2015
USD ($)
[1]
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
[1]
Mar. 31, 2015
USD ($)
[1]
Dec. 31, 2014
USD ($)
[1]
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2016
EUR (€)
Debt Instruments [Abstract]                            
Short-term debt, weighted average interest rate 0.80%   1.10%       0.80%       1.10% 0.80%   1.10%
Cash paid for interest, net of amounts capitalized                     $ 120.6 $ 96.8 $ 131.3  
Debt Instrument [Line Items]                            
Payments on long-term debt                     480.4 699.4 602.2  
Loss on extinguishment of debt     $ 6.9 [1] $ 0.0 $ 0.0 $ 0.0 $ 16.6 [1] $ 0.0 $ 0.0 $ 0.0 $ 6.9 [1] 16.6 [1] $ 0.0  
Eurobonds .375%                            
Debt Instrument [Line Items]                            
Debt instrument, issuance date                     Jun. 01, 2016      
Debt instrument, maturity date                     Jun. 01, 2021      
Interest rate of debt, stated percentage     0.375%               0.375%     0.375%
Debt instrument, Maturity Year                     2021      
Debt instrument, principal amount     $ 386.9               $ 386.9     € 350
Note 2.0%                            
Debt Instrument [Line Items]                            
Debt instrument, maturity date                     Aug. 02, 2016      
Senior Notes $ 350.0   $ 0.0       $ 350.0       $ 0.0 $ 350.0    
Interest rate of debt, stated percentage     2.00%               2.00%     2.00%
Debt instrument, Maturity Year                     2016      
Payments on long-term debt                     $ 350.0      
CLP Series E bonds 6.3%                            
Debt Instrument [Line Items]                            
Debt instrument, maturity date Jan. 22, 2030 Jan. 22, 2030                        
Interest rate of debt, stated percentage 6.30%           6.30%         6.30%    
Payments on long-term debt $ 146.6                          
Loss on extinguishment of debt 16.6                          
Loss on extinguishment of debt, net of tax $ 14.2                          
Loss on extinguishment of debt, per share, net of tax | $ / shares $ 0.07                          
Extinguishment of debt amount $ 130.0 CLF 3,000,000                        
Revolving Credit Facility [Member] | Credit Agreement 2013 Member [Member]                            
Debt Instrument [Line Items]                            
Credit facility, initiation date                     Apr. 30, 2013      
Credit facility, maximum borrowing capacity     $ 2,690.0               $ 2,690.0      
Credit facility, expiration date                     Apr. 30, 2018      
Credit facility, amount borrowed and outstanding     $ 0.0               $ 0.0      
Revolving Credit Facility [Member] | Credit Agreement 2013 Member [Member] | Maximum [Member]                            
Debt Instrument [Line Items]                            
Covenant, ratio of total debt to total capitalization     70.00%               70.00%     70.00%
Foreign Subsidiary Facility [Member]                            
Debt Instrument [Line Items]                            
Credit facility, maximum borrowing capacity     $ 51.3               $ 51.3      
Credit facility, amount borrowed and outstanding     $ 51.3               $ 51.3      
[1] For additional information, see Note 15, Debt.