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Accumulated Other Comprehensive Income Activity (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance $ (53.4)    
OCI excluding reclassifications (0.7)    
Reclassifications to earnings (4.5)    
OCI, net of tax (5.2) 3.3 (31.9)
Ending Balance (58.6) (53.4)  
Unrealized Gain On Investment
     
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance 0.3    
OCI excluding reclassifications       
Reclassifications to earnings       
OCI, net of tax       
Ending Balance 0.3    
Accrued Benefit Cost
     
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (70.1)    
OCI excluding reclassifications 19.2    
Reclassifications to earnings 4.6    
OCI, net of tax 23.8    
Ending Balance (46.3)    
Derivative Financial Instruments
     
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (1.3)    
OCI excluding reclassifications 11.4    
Reclassifications to earnings (9.1)    
OCI, net of tax 2.3    
Ending Balance 1.0    
Cumulative Translation Adjustment
     
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance 17.7    
OCI excluding reclassifications (31.3)    
Reclassifications to earnings       
OCI, net of tax (31.3)    
Ending Balance $ (13.6)