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Postretirement Benefit Plans - Fair Value Measurement Pension Plan and Post Retirement Welfare (Detail) (USD $) In Millions, unless otherwise specified						12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Pension [Member]	Dec. 31, 2011 Pension [Member]	Dec. 31, 2010 Pension [Member]	Dec. 31, 2011 Pension [Member] Level 3 [Member]	Dec. 31, 2011 Pension [Member] Level 3 [Member] Equity Securities [Member]	Dec. 31, 2011 Pension [Member] Level 3 [Member] Private Equity [Member]	Dec. 31, 2011 Pension [Member] Level 3 [Member] Absolute Return [Member]	Dec. 31, 2011 Pension [Member] Level 3 [Member] Commodities, fixed income and other [Member]
Defined Benefit Plan Disclosure [Line Items]
Plan assets - January 1	$ 257.0	$ 191.8	$ 249.1	$ 184.3	$ 186.7	$ 81.5	$ 10.6	$ 48.0	$ 20.4	$ 2.5
Realized gains (losses), net						1.4	(1.0)	2.6	(0.2)
Unrealized gains (losses), net
Purchases/(sales) and settlements, net						(82.9)	(9.6)	(50.6)	(20.2)	(2.5)
Transfers in (out), net
Plan assets - December 31	$ 257.0	$ 191.8	$ 249.1	$ 184.3	$ 186.7

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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