Saving Plans, Pension and Post Retirement Benefits - Fair Value of Asset Categories (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 557.6		$ 520.2
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7.5		6.9
Common and preferred stock | U.S. small/mid cap equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	23.1		18.9
Mutual funds | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	24.4	[1]	19.4	[1]
Mutual funds | Government bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	15.1	[1]	16.0	[1]
Mutual funds | U.S. large cap equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	68.7	[1]	63.2	[1]
Mutual funds | International equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4.3	[1]	4.6	[1]
Mutual funds | Emerging markets international equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4.2	[1]	5.0	[1]
Mutual funds | Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.9	[1]	3.6	[1]
Fixed income securities | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	46.1		49.8
Fixed income securities | Government bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9.6		9.9
Common and collective funds | U.S. small/mid cap equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	23.0	[1]	17.7	[1]
Common and collective funds | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	53.7	[1]	57.0	[1]
Common and collective funds | Government bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	69.8	[1]	70.2	[1]
Common and collective funds | U.S. large cap equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	33.8	[1]	27.0	[1]
Common and collective funds | International equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	92.1	[1]	74.3	[1]
Common and collective funds | Emerging markets international equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	17.3	[1]	17.7	[1]
Common and collective funds | Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2.9	[1]	1.1	[1]
Common and collective funds | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2.0	[1]	3.0	[1]
Hedge funds | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	11.8	[1]	4.2	[1]
Hedge funds | Government bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	24.5	[1]	30.9	[1]
Hedge funds | U.S. large cap equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4.3	[1]	4.6	[1]
Hedge funds | International equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6.1	[1]	3.1	[1]
Hedge funds | Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4.1	[1]	3.8	[1]
Hedge funds | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5.7	[1]	6.0	[1]
Hedge funds | Foreign exchange contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets			0	[1]
Group annuity contract
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2.6		2.3
Quoted Prices in Active Markets for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	148.2		137.6
Quoted Prices in Active Markets for Identical Assets (Level 1) | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7.5		6.9
Quoted Prices in Active Markets for Identical Assets (Level 1) | Common and preferred stock | U.S. small/mid cap equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	23.1		18.9
Quoted Prices in Active Markets for Identical Assets (Level 1) | Mutual funds | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	24.4	[1]	19.4	[1]
Quoted Prices in Active Markets for Identical Assets (Level 1) | Mutual funds | Government bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	15.1	[1]	16.0	[1]
Quoted Prices in Active Markets for Identical Assets (Level 1) | Mutual funds | U.S. large cap equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	68.7	[1]	63.2	[1]
Quoted Prices in Active Markets for Identical Assets (Level 1) | Mutual funds | International equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4.3	[1]	4.6	[1]
Quoted Prices in Active Markets for Identical Assets (Level 1) | Mutual funds | Emerging markets international equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4.2	[1]	5.0	[1]
Quoted Prices in Active Markets for Identical Assets (Level 1) | Mutual funds | Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.9	[1]	3.6	[1]
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed income securities | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed income securities | Government bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Common and collective funds | U.S. small/mid cap equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Quoted Prices in Active Markets for Identical Assets (Level 1) | Common and collective funds | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Quoted Prices in Active Markets for Identical Assets (Level 1) | Common and collective funds | Government bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Quoted Prices in Active Markets for Identical Assets (Level 1) | Common and collective funds | U.S. large cap equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Quoted Prices in Active Markets for Identical Assets (Level 1) | Common and collective funds | International equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Quoted Prices in Active Markets for Identical Assets (Level 1) | Common and collective funds | Emerging markets international equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Quoted Prices in Active Markets for Identical Assets (Level 1) | Common and collective funds | Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Quoted Prices in Active Markets for Identical Assets (Level 1) | Common and collective funds | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Quoted Prices in Active Markets for Identical Assets (Level 1) | Hedge funds | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Quoted Prices in Active Markets for Identical Assets (Level 1) | Hedge funds | Government bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Quoted Prices in Active Markets for Identical Assets (Level 1) | Hedge funds | U.S. large cap equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Quoted Prices in Active Markets for Identical Assets (Level 1) | Hedge funds | International equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Quoted Prices in Active Markets for Identical Assets (Level 1) | Hedge funds | Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Quoted Prices in Active Markets for Identical Assets (Level 1) | Hedge funds | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Quoted Prices in Active Markets for Identical Assets (Level 1) | Hedge funds | Foreign exchange contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets			0	[1]
Quoted Prices in Active Markets for Identical Assets (Level 1) | Group annuity contract
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Significant Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	407.5		382.0
Significant Observable Inputs (Level 2) | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Significant Observable Inputs (Level 2) | Common and preferred stock | U.S. small/mid cap equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Significant Observable Inputs (Level 2) | Mutual funds | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Significant Observable Inputs (Level 2) | Mutual funds | Government bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Significant Observable Inputs (Level 2) | Mutual funds | U.S. large cap equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Significant Observable Inputs (Level 2) | Mutual funds | International equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Significant Observable Inputs (Level 2) | Mutual funds | Emerging markets international equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Significant Observable Inputs (Level 2) | Mutual funds | Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Significant Observable Inputs (Level 2) | Fixed income securities | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	45.8		49.2
Significant Observable Inputs (Level 2) | Fixed income securities | Government bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8.0		9.9
Significant Observable Inputs (Level 2) | Common and collective funds | U.S. small/mid cap equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	23.0	[1]	17.7	[1]
Significant Observable Inputs (Level 2) | Common and collective funds | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	53.7	[1]	57.0	[1]
Significant Observable Inputs (Level 2) | Common and collective funds | Government bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	69.8	[1]	70.2	[1]
Significant Observable Inputs (Level 2) | Common and collective funds | U.S. large cap equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	33.8	[1]	27.0	[1]
Significant Observable Inputs (Level 2) | Common and collective funds | International equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	92.1	[1]	74.3	[1]
Significant Observable Inputs (Level 2) | Common and collective funds | Emerging markets international equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	17.3	[1]	17.7	[1]
Significant Observable Inputs (Level 2) | Common and collective funds | Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2.9	[1]	1.1	[1]
Significant Observable Inputs (Level 2) | Common and collective funds | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2.0	[1]	3.0	[1]
Significant Observable Inputs (Level 2) | Hedge funds | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	11.8	[1]	4.2	[1]
Significant Observable Inputs (Level 2) | Hedge funds | Government bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	24.5	[1]	30.9	[1]
Significant Observable Inputs (Level 2) | Hedge funds | U.S. large cap equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4.3	[1]	4.6	[1]
Significant Observable Inputs (Level 2) | Hedge funds | International equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6.1	[1]	3.1	[1]
Significant Observable Inputs (Level 2) | Hedge funds | Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4.1	[1]	3.8	[1]
Significant Observable Inputs (Level 2) | Hedge funds | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5.7	[1]	6.0	[1]
Significant Observable Inputs (Level 2) | Hedge funds | Foreign exchange contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets			0	[1]
Significant Observable Inputs (Level 2) | Group annuity contract
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2.6		2.3
Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1.9		0.6
Significant Unobservable Inputs (Level 3) | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Significant Unobservable Inputs (Level 3) | Common and preferred stock | U.S. small/mid cap equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Significant Unobservable Inputs (Level 3) | Mutual funds | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Significant Unobservable Inputs (Level 3) | Mutual funds | Government bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Significant Unobservable Inputs (Level 3) | Mutual funds | U.S. large cap equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Significant Unobservable Inputs (Level 3) | Mutual funds | International equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Significant Unobservable Inputs (Level 3) | Mutual funds | Emerging markets international equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Significant Unobservable Inputs (Level 3) | Mutual funds | Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Significant Unobservable Inputs (Level 3) | Fixed income securities | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.3		0.6
Significant Unobservable Inputs (Level 3) | Fixed income securities | Government bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1.6		0
Significant Unobservable Inputs (Level 3) | Common and collective funds | U.S. small/mid cap equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Significant Unobservable Inputs (Level 3) | Common and collective funds | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Significant Unobservable Inputs (Level 3) | Common and collective funds | Government bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Significant Unobservable Inputs (Level 3) | Common and collective funds | U.S. large cap equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Significant Unobservable Inputs (Level 3) | Common and collective funds | International equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Significant Unobservable Inputs (Level 3) | Common and collective funds | Emerging markets international equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Significant Unobservable Inputs (Level 3) | Common and collective funds | Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Significant Unobservable Inputs (Level 3) | Common and collective funds | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Significant Unobservable Inputs (Level 3) | Hedge funds | Corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Significant Unobservable Inputs (Level 3) | Hedge funds | Government bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Significant Unobservable Inputs (Level 3) | Hedge funds | U.S. large cap equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Significant Unobservable Inputs (Level 3) | Hedge funds | International equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Significant Unobservable Inputs (Level 3) | Hedge funds | Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Significant Unobservable Inputs (Level 3) | Hedge funds | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Significant Unobservable Inputs (Level 3) | Hedge funds | Foreign exchange contracts
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets			0	[1]
Significant Unobservable Inputs (Level 3) | Group annuity contract
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0		$ 0

[1] The investments in mutual funds, common and collective funds and hedge funds are disclosed above within the respective underlying investments’ class (i.e., various equities, corporate bonds, government bonds and other investment classes), while the fair value hierarchy levels of the investments are based on the Company’s direct ownership unit of account.