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Amounts in Accumulated Other Comprehensive Income that have not yet been Recognized as Components of Net Periodic Benefit Cost (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2011
Pension Benefits
Dec. 31, 2013
Pension Benefits
Dec. 31, 2012
Pension Benefits
Dec. 31, 2013
Pension Benefits
Other Accumulated Other Comprehensive Income
Dec. 31, 2012
Pension Benefits
Other Accumulated Other Comprehensive Income
Jun. 30, 2013
Postretirement Benefits
Dec. 31, 2013
Postretirement Benefits
Dec. 31, 2012
Postretirement Benefits
Dec. 31, 2013
Postretirement Benefits
Other Accumulated Other Comprehensive Income
Dec. 31, 2012
Postretirement Benefits
Other Accumulated Other Comprehensive Income
Defined Benefit Plan Disclosure [Line Items]                          
Beginning Balance             $ 72.2 $ 63.5       $ 4.3 $ 6.0
Actuarial (gain) loss 5.2 42.2 80.0   (73.0) 66.0 (0.9) (30.6) 4.0 (0.3) 9.9 (4.5) (11.6)
Current year actuarial gain             (105.6) 39.3       (0.3) 9.9
Ending Balance             (34.3) 72.2       (0.5) 4.3
Beginning Balance             0.6 0.5       (26.2) 1.0
Prior service cost (credit) recognition due to plan amendments       (1.8)       0.4       (34.7) (29.8)
Amortization             (0.1) (0.3)       27.4 2.6
Ending Balance             0.5 0.6       (33.5) (26.2)
Total at December 31, 2013             $ (33.8)         $ (34.0)