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Employee Benefit Obligations - Expected Future Pension Benefit Payments (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Compensation and Retirement Disclosure [Abstract]  
2014 $ 13.8
2015 12.0
2016 12.2
2017 12.7
2018 13.7
2019 to 2023 $ 72.1