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Benefit Plans - Plan Assets Using Fair Value Methodologies (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 572.3 | $ 575.2
Cash and Cash Equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 7.7 | 27.4
Fixed income | Foreign Government |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 262.2 | 164.3
Fixed income | US Treasury Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 75.5 | 69.4
Fixed income | Collateralized Mortgage Backed Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 8.7 | 23.4
Fixed income | Other securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 34.1 | 28.1
Equity securities | U S Mid Cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 7.3 | 6.7
Equity securities | U S Large Cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 43.5 | 89.0
Equity securities | International Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 101.9 | 89.8
Equity securities | US Long/Short Equity Fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0.6 | 47.6
Other Investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 30.8 | 29.5
Fair Value, Inputs, Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1.8 | 6.2
Fair Value, Inputs, Level 1 | Cash and Cash Equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1.8 | 6.2
Fair Value, Inputs, Level 1 | Equity securities | U S Mid Cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 0
Fair Value, Inputs, Level 1 | Equity securities | International Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 0
Fair Value, Inputs, Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 551.5 | 550.7
Fair Value, Inputs, Level 2 | Cash and Cash Equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 5.9 | 21.2
Fair Value, Inputs, Level 2 | Fixed income | Foreign Government |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 262.2 | 164.3
Fair Value, Inputs, Level 2 | Fixed income | US Treasury Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 75.5 | 69.4
Fair Value, Inputs, Level 2 | Fixed income | Collateralized Mortgage Backed Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 8.7 | 23.4
Fair Value, Inputs, Level 2 | Fixed income | Other securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 34.1 | 28.1
Fair Value, Inputs, Level 2 | Equity securities | U S Mid Cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 7.3 | 6.7
Fair Value, Inputs, Level 2 | Equity securities | U S Large Cap |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 43.5 | 89.0
Fair Value, Inputs, Level 2 | Equity securities | International Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 101.9 | 89.8
Fair Value, Inputs, Level 2 | Equity securities | US Long/Short Equity Fund |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 0.6 | 47.6
Fair Value, Inputs, Level 2 | Other Investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 11.8 | 11.2
Fair Value, Inputs, Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 19.0 | 18.3
Fair Value, Inputs, Level 3 | Fixed income | Foreign Government |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 0
Fair Value, Inputs, Level 3 | Fixed income | Collateralized Mortgage Backed Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 0
Fair Value, Inputs, Level 3 | Fixed income | Other securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 0
Fair Value, Inputs, Level 3 | Other Investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 19.0 | $ 18.3

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(iv)(b)(i) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=6867990&loc=d3e12355-114930 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 49 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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