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Pension Benefit Obligations (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Dec. 31, 2013
U.S.
Dec. 31, 2012
U.S.
Sep. 30, 2014
U.S.
Dec. 31, 2013
Int'l
Dec. 31, 2012
Int'l
Sep. 30, 2014
Int'l
Pension plans.                
Service costs           $ 0.2 $ 0.3  
Interest cost on projected benefit obligation     1.9 1.6   6.8 6.1  
Expected return on plan assets     (2.1) (2.1)   (6.4) (5.9)  
Amortization of net loss     1.0 1.1   1.2 1.0  
Settlement loss recognized             0.8  
Net periodic cost     0.8 0.6   1.8 2.3  
Employer contributions     1.1     3.9    
Expected remaining scheduled annual employer contributions for the current fiscal year         3.8     12.1
Net pension liabilities included in other long-term liabilities $ 190.7 $ 192.7