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Pension Benefit Obligations (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2014
Sep. 30, 2013
Mar. 31, 2014
U.S.
Mar. 31, 2013
U.S.
Mar. 31, 2014
U.S.
Mar. 31, 2013
U.S.
Sep. 30, 2014
U.S.
Mar. 31, 2014
Int'l
Mar. 31, 2013
Int'l
Mar. 31, 2014
Int'l
Mar. 31, 2013
Int'l
Sep. 30, 2014
Int'l
Pension plans.                        
Service costs               $ 0.2 $ 0.2 $ 0.4 $ 0.5  
Interest cost on projected benefit obligation     1.9 1.7 3.8 3.3   7.0 6.0 13.8 12.1  
Expected return on plan assets     (2.1) (2.2) (4.2) (4.3)   (6.5) (5.7) (12.9) (11.5)  
Amortization of prior service costs               (0.1)   (0.1) (0.1)  
Amortization of net loss     1.0 1.1 2.0 2.2   1.2 1.0 2.4 2.0  
Settlement loss recognized                 1.8   2.6  
Net periodic (benefit) cost     0.8 0.6 1.6 1.2   1.8 3.3 3.6 5.6  
Employer contributions         2.3         8.2    
Expected remaining scheduled annual employer contributions for the current fiscal year             2.7         8.1
Net pension liabilities included in other long-term liabilities $ 186.6 $ 192.7