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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
Defined Benefit Pension Plans [Member]
        
Defined benefit plans        
Service cost $ 2.6 $ 2.8 $ 5.2 $ 5.5
Interest cost 6.5 7.0 12.9 13.6
Expected return on plan assets (5.5) (5.8) (11.0) (11.4)
Amortization of prior service cost 0.4 0.4 0.8 0.8
Amortization net transition obligations 0.1 0.1 0.2 0.2
Recognized actuarial losses 2.3 1.9 4.6 3.7
Total 6.4 6.4 12.7 12.4
Other Postretirement Benefit Plans [Member]
        
Defined benefit plans        
Service cost     0.1 0.1
Interest cost 0.3 0.3 0.5 0.5
Amortization of prior service cost (0.4) (0.5) (0.9) (1.1)
Recognized actuarial losses   (0.1)    
Total $ (0.1) $ (0.3) $ (0.3) $ (0.5)