Amounts in Accumulated Other Comprehensive Loss Expected to be Recognized Next Fiscal Year (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2013
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	$ 31.4
Net prior service credit
Total	31.4
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss
Net prior service credit	(25.8)
Total	$ (25.8)

Amount included in accumulated other comprehensive income (AOCI) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position, including gain (loss), prior service cost (credit), and transition asset (obligation).

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration