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Retirement and Postretirement Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Pension [Member]
        
Components of net periodic benefit cost        
Service cost $ 9.2 $ 8.4 $ 19.3 $ 17.2
Interest cost 33.3 37.8 67.3 75.6
Expected return on plan assets (58.9) (55.3) (116.2) (110.5)
Amortization of prior service cost (credit) 1.1 2.4 2.3 4.7
Amortization of net actuarial loss 29.1 20.5 58.3 41.7
Pension curtailments and settlements 5.2 10.7 5.2 10.7
Net periodic benefit cost 19.0 24.5 36.2 39.4
Postretirement Benefit Plans [Member]
        
Components of net periodic benefit cost        
Service cost 0.7 0.5 1.5 1.2
Interest cost 5.1 6.7 10.8 13.9
Expected return on plan assets (3.0) (2.5) (5.8) (5.3)
Amortization of prior service cost (credit) 0 0 (0.1) (0.1)
Amortization of net actuarial loss (0.5) 0.2 1.2 1.3
Pension curtailments and settlements 0 0 0 0
Net periodic benefit cost $ 2.3 $ 4.9 $ 7.6 $ 11.0