Schedule Of Fair Values Of Pension Plan Assets By Asset Category (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 100.2		$ 78.8
Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9.0		1.0
Equity Securities - Mutual Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	16.1	[1]	14.3	[1]
Bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9.3	[2]	9.8	[2]
Money Market Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6.6
Global Multi-Strategy Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	37.8	[3]	31.8	[3]
Insurance Investment Contract
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5.9	[4]	5.3	[4]
Government Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	15.3	[5]	15.0	[5]
Pension Plan Investments, Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.2	[6]	1.6	[6]
Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10.2		2.1
Fair Value, Inputs, Level 1 | Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9.0		1.0
Fair Value, Inputs, Level 1 | Equity Securities - Mutual Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1.0	[1]	0.9	[1]
Fair Value, Inputs, Level 1 | Bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[2]	0.1	[2]
Fair Value, Inputs, Level 1 | Money Market Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Fair Value, Inputs, Level 1 | Global Multi-Strategy Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[3]	0	[3]
Fair Value, Inputs, Level 1 | Insurance Investment Contract
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[4]	0	[4]
Fair Value, Inputs, Level 1 | Government Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[5]	0	[5]
Fair Value, Inputs, Level 1 | Pension Plan Investments, Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.2	[6]	0.1	[6]
Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	46.3		39.6
Fair Value, Inputs, Level 2 | Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Fair Value, Inputs, Level 2 | Equity Securities - Mutual Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	15.1	[1]	13.4	[1]
Fair Value, Inputs, Level 2 | Bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	9.3	[2]	9.7	[2]
Fair Value, Inputs, Level 2 | Money Market Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6.6
Fair Value, Inputs, Level 2 | Global Multi-Strategy Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[3]	0	[3]
Fair Value, Inputs, Level 2 | Insurance Investment Contract
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[4]	0	[4]
Fair Value, Inputs, Level 2 | Government Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	15.3	[5]	15.0	[5]
Fair Value, Inputs, Level 2 | Pension Plan Investments, Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[6]	1.5	[6]
Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	43.7		37.1
Fair Value, Inputs, Level 3 | Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Fair Value, Inputs, Level 3 | Equity Securities - Mutual Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[1]	0	[1]
Fair Value, Inputs, Level 3 | Bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[2]	0	[2]
Fair Value, Inputs, Level 3 | Money Market Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0
Fair Value, Inputs, Level 3 | Global Multi-Strategy Fund
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	37.8	[3]	31.8	[3]
Fair Value, Inputs, Level 3 | Insurance Investment Contract
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5.9	[4]	5.3	[4]
Fair Value, Inputs, Level 3 | Government Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	[5]	0	[5]
Fair Value, Inputs, Level 3 | Pension Plan Investments, Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	[6]	$ 0	[6]

[1] The equity securities represent mutual funds held primarily by the pension plans in Canada, which include both domestic and international equity securities. Mutual funds are valued at quoted market prices, which represent the net asset values of shares held by the plans as of December 31, 2012 and December 31, 2013.

[2] The bond funds constitutes investments primarily for the pension plans in Canada and the fund consists of investments in Canadian government, corporate and municipal or local governments bonds.

[3] The global multi-strategy fund constitutes investments for the pension plans in the United Kingdom. The fund is a fund of funds invested in a series of diverse international equity funds and fixed income funds. The Global Multi-strategy fund is valued at quoted market prices which represent the net asset value of the units held at December 31, 2012 and December 31, 2013.

[4] The insurance investment contract is in the form of an insurance policy that is held by the pension plans in the United Kingdom. The investment of the underlying assets is in various managed funds. Insurance contracts are valued at book value, which approximates fair value, and are calculated using the prior year balance adjusted for investment returns and changes in cash flows.

[5] Government fixed income securities held by pension plans in the United Kingdom are valued at the net asset value per share multiplied by the number of shares held as of the measurement date.

[6] Other category includes other investments for pension plans in the International subsidiaries.