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Employee Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Employee Benefit Plans (Textual) [Abstract]        
Expected contributions for pension plans in 2012 $ 27   $ 27  
Defined Benefit Plans [Member]
        
Components of Net Periodic Benefit Cost        
Service cost 2.6 2.8 5.2 5.5
Interest cost 5.8 6.3 11.6 12.2
Expected return on plan assets (4.6) (4.9) (9.2) (9.5)
Amortization of prior service (credit) cost 0.4 0.4 0.8 0.8
Amortization of net transition obligations 0.1 0.1 0.2 0.2
Recognized actuarial losses 2.0 1.7 4.0 3.3
Total 6.3 6.4 12.6 12.5
Postretirement Benefits [Member]
        
Components of Net Periodic Benefit Cost        
Service cost     0.1 0.1
Interest cost 0.2 0.2 0.3 0.3
Amortization of prior service (credit) cost (0.1) (0.2) (0.3) (0.4)
Recognized actuarial losses 0.1   0.2 0.1
Total $ 0.2   $ 0.3 $ 0.1