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Pension Benefit Obligations (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 3 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Dec. 31, 2012
U.S.
Dec. 31, 2011
U.S.
Sep. 30, 2013
U.S.
Dec. 31, 2012
Int'l
Dec. 31, 2011
Int'l
Sep. 30, 2013
Int'l
Components of net periodic (benefit) cost:                
Service costs           $ 0.3 $ 0.3  
Interest cost on projected benefit obligation     1.6 1.9   6.1 6.4  
Expected return on plan assets     (2.1) (2.1)   (5.9) (6.3)  
Amortization of net loss     1.1 0.8   1.0 0.5  
Settlement loss recognized           0.8 0.5  
Net periodic cost     0.6 0.6   2.3 1.4  
Employer contributions     1.8     4.4    
Expected remaining scheduled annual employer contributions for the current fiscal year         7.1     12.9
Net pension liabilities included in other long-term liabilities $ 185.9 $ 192.2