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Postretirement and Other Benefits Expected Benefit Payments (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Pension Benefit Plans
 
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
2012 $ 46.9
2013 48.8
2014 51.7
2015 54.3
2016 57.7
2017 - 2021 333.1
Postretirement Health Care Benefits
 
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
2012 3.2
2013 3.3
2014 3.4
2015 3.7
2016 4.1
2017 - 2021 $ 21.9