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Employee Benefit Plans (Summary Of Components Of Net Periodic Benefit Cost) (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2011
Dec. 31, 2012
Pension Plans [Member]
Dec. 31, 2011
Pension Plans [Member]
Dec. 31, 2010
Pension Plans [Member]
Dec. 31, 2012
Pension Plans [Member]
Minimum [Member]
Dec. 31, 2011
Pension Plans [Member]
Minimum [Member]
Dec. 31, 2010
Pension Plans [Member]
Minimum [Member]
Dec. 31, 2012
Pension Plans [Member]
Maximum [Member]
Dec. 31, 2011
Pension Plans [Member]
Maximum [Member]
Dec. 31, 2010
Pension Plans [Member]
Maximum [Member]
Dec. 31, 2012
Postretirement Plans [Member]
Dec. 31, 2011
Postretirement Plans [Member]
Dec. 31, 2010
Postretirement Plans [Member]
Dec. 31, 2012
Postretirement Plans [Member]
Minimum [Member]
Dec. 31, 2011
Postretirement Plans [Member]
Minimum [Member]
Dec. 31, 2010
Postretirement Plans [Member]
Minimum [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                                
Service cost   $ 6.0 $ 5.1 $ 5.8             $ 1.1 $ 1.0 $ 1.2      
Interest cost   41.5 42.3 41.7             8.4 11.9 11.5      
Expected return on plan assets   (49.3) (48.1) (44.7)             (2.1) (2.9) (3.6)      
Net amortization   27.2 20.8 17.8             0.2 (5.7) (10.0)      
Curtailment/Settlement (1.0) 0.7 1.3 0.8             0 (1.1) 0      
Net periodic expense (credit)   $ 26.1 $ 21.4 $ 21.4             $ 7.6 $ 3.2 $ (0.9)      
Weighted-average assumptions used to determine net periodic costs, during the year, Discount rate   4.70% 5.40% 5.80%             4.30% 5.00% 5.40%      
Weighted-average assumptions used to determine net periodic costs, during the year, Expected return on plan assets   6.60% 7.20% 7.30%             6.75% 7.00% 7.25%      
Weighted-average assumptions used to determine net periodic costs, during the year, Rate of compensation increase         2.50% 2.50% 2.50% 4.50% 4.50% 10.00%               
Weighted-average assumptions used to determine net periodic costs, end of the year, Discount rate   4.00% 4.70% 5.40%             3.50% 4.30% 5.00%      
Weighted-average assumptions used to determine net periodic costs, end of the year, Rate of compensation increase         2.50% 2.50% 2.50% 4.50% 4.50% 10.00%