Quarterly report pursuant to Section 13 or 15(d)

Accumulated Other Comprehensive Income (Reclassifications Out Of Accumulated Other Comprehensive Income) (Detail)

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Accumulated Other Comprehensive Income (Reclassifications Out Of Accumulated Other Comprehensive Income) (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Amortization of defined benefit pension items:    
Total net periodic benefit cost, net of tax $ (3.0) $ (3.4)
Amount Reclassified From Accumulated Other Comprehensive Income [Member]
    
Amortization of defined benefit pension items:    
Prior service cost (0.3) [1],[2]  
Recognized actuarial loss (4.4) [1],[2]  
Total net periodic benefit cost, before tax (4.7) [1]  
Total net periodic benefit cost, tax benefit 1.8 [1]  
Total net periodic benefit cost, net of tax $ (2.9) [1]  
[1] Amounts in parentheses indicate expense recognized in the Consolidated Statements of Income.
[2] These accumulated other comprehensive income components are included in the computation of net periodic pension cost (See Note 8 Benefit Plans for additional details).