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Retirement and Postretirement Plans (Periodic Benefit Cost) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Components of net periodic benefit cost (income)      
Service cost $ 0.7 $ 0.8 $ 0.8
Interest cost 4.7 5.2 6.0
Expected return on plan assets (6.9) (7.6) (7.3)
Amortization of unrecognized loss 0.8 0.5 0.6
Net periodic pension (income) cost before settlements, curtailments and special termination benefits (0.7) (1.1) 0.1
Settlement gain (loss) 0.6 0.5 (0.1)
Special termination benefits expense 0.6 [1] 0.8 [1] 1.9 [1]
Total net periodic benefit cost $ 0.5 $ 0.2 $ 1.9
Weighted average discount rate assumptions used to determine benefit obligations      
Discount rate (as a percent) 3.64% 4.38%  
Weighted average assumptions used to determine net periodic benefit cost      
Discount rate (as a percent) 4.38% 4.94%  
Expected long-term rate of return on plan assets (as a percent) 5.75% 5.75%  
[1] Net actuarial losses resulted from a decrease in investment returns on plan assets in the year ended December 31, 2011 and changes in assumptions in estimating the projected benefit obligation in the years ended December 31, 2012 and 2011