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Employee Benefits (Future Contributions) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]  
Expected employer contribution in 2013 $ 62.6
Expected benefit payments  
2013 69.4
2014 69.0
2015 70.5
2016 70.5
2017 71.3
2018-2022 $ 378.0