Pension Plans and Other Postretirement Benefits - Current Forecast of Benefit Payments which Reflect Expected Future Service (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014
Total Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
2015	$ 41.6
2016	40.6
2017	42.5
2018	45.2
2019	43.4
2020-2024	230.8
Domestic Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
2015	40.1
2016	39.1
2017	40.1
2018	43.8
2019	41.9
2020-2024	216.7
Total Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
2015	5.0
2016	4.9
2017	4.6
2018	4.4
2019	4.2
2020-2024	$ 19.1

Defined Benefit Plan, Expected Future Benefit Payments in Year Six Through Ten

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- Definition

Amount of benefits from a defined benefit plan expected to be paid in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ 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 (f)

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

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- Definition

Amount of benefits from a defined benefit plan expected to be paid in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Amount of benefits from a defined benefit plan expected to be paid in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Amount of benefits from a defined benefit plan expected to be paid in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Amount of benefits from a defined benefit plan expected to be paid in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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