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Summary of Changes in Accumulated Other Comprehensive Income (Loss), Net of Tax (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]      
Balance at end of year $ (166.1) $ (300.8)  
Accumulated Defined Benefit Plans Adjustment
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance at beginning of year (249.9) (239.1) (57.4)
Reclassification adjustments 11.0 4.2 13.3
Other comprehensive income (loss) recognized during the period 134.4 (15.0) (195.0)
Balance at end of year (104.5) (249.9) (239.1)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance at beginning of year 2.7 (37.6) (1.3)
Reclassification adjustments (21.0) 2.0 11.9
Other comprehensive income (loss) recognized during the period 13.0 38.3 (48.2)
Balance at end of year (5.3) 2.7 (37.6)
Accumulated Translation Adjustment
      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance at beginning of year (53.6) (55.3) (19.3)
Other comprehensive income (loss) recognized during the period (2.7) 1.7 (36.0)
Balance at end of year $ (56.3) $ (53.6) $ (55.3)