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Postretirement 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
Net periodic benefit cost        
Service cost $ 2.1 $ 2.2 $ 4.0 $ 4.4
Interest cost 6.3 6.3 12.2 12.7
Expected return on plan assets (5.2) (4.8) (9.4) (9.7)
Amortization of prior service cost (benefit) 0.2 0.3 0.4 0.5
Amortization of net actuarial loss 2.7 1.5 5.2 2.9
Net periodic benefit cost (income) 6.1 5.5 12.4 10.8
Pension [Member]
        
Net periodic benefit cost        
Service cost 1.6 1.7 2.9 3.3
Interest cost 4.1 4.0 7.7 8.0
Expected return on plan assets (5.0) (4.7) (9.1) (9.4)
Amortization of prior service cost (benefit) 0.2 0.3 0.5 0.6
Amortization of net actuarial loss 1.6 0.9 3.1 1.7
Net periodic benefit cost (income) 2.5 2.2 5.1 4.2
Other Benefits [Member]
        
Net periodic benefit cost        
Service cost 0.5 0.5 1.1 1.1
Interest cost 2.2 2.3 4.5 4.7
Expected return on plan assets (0.2) (0.1) (0.3) (0.3)
Amortization of prior service cost (benefit) 0 0 (0.1) (0.1)
Amortization of net actuarial loss 1.1 0.6 2.1 1.2
Net periodic benefit cost (income) $ 3.6 $ 3.3 $ 7.3 $ 6.6