Minimum percentage of benchmark performance of manager comparing to other peers.

No definition available.

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- Definition

Number of days of treasury bills with which comparison of target return on cash and cash equivalents had done.

+ References

No definition available.

+ Details

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- Definition

The interest rate used to adjust for the time value of money for the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (k)(1)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

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- Definition

Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) 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.

+ References

No definition available.

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- Definition

Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) 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.

+ References

No definition available.

+ Details

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- Definition

If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 55

-Paragraph 17

-URI http://asc.fasb.org/extlink&oid=34716465&loc=d3e4179-114921

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2417-114920

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- Definition

Amount of administrative expenses incurred by a defined contribution plan.

+ References

No definition available.

+ Details

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- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

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Retirement Plans and Other Post-Retirement Benefits - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation for all defined benefit pension plans	$ 553.8	$ 471.1
Manager's benchmarked performance minimum	40.00%
Treasury bills days	90 days
Defined contribution plans Employees contribution	50.00%
Expense associated with Defined Contribution Plans	2.0	1.9	1.7
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rates	4.21%	5.20%
Prior service cost as a component of net periodic benefit cost from accumulated other comprehensive income (loss)	3.1
Actuarial net (gain) loss as a component of net periodic benefit cost from accumulated other comprehensive income (loss)	0.3
Pension Benefits [Member] \| Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rates	2.00%
Pension Benefits [Member] \| Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rates	4.36%
Other Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rates	3.89%	4.52%
Prior service cost as a component of net periodic benefit cost from accumulated other comprehensive income (loss)	18.3
Actuarial net (gain) loss as a component of net periodic benefit cost from accumulated other comprehensive income (loss)	$ 0.4
Other Benefits [Member] \| Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rates	3.56%
Other Benefits [Member] \| Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rates	3.95%