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Other Post Retirement Employee Benefit Plans (Benefit Payments That Reflect Expected Future Service) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]  
2013 $ 188.2
2014 193.2
2015 197.3
2016 199.8
2017 205.3
2018-2022 1,064.1
Other Post-Retirement Benefits
 
Defined Benefit Plan Disclosure [Line Items]  
2013 18.2
2014 18.3
2015 18.5
2016 18.9
2017 19.0
2018-2022 $ 92.3