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Pension and Other Postretirement Benefit Plans - Recurring Fair Value Measures (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
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Pension [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | $ 501.6 |  | $ 460.1 |  | $ 432.4
Pension [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 234.2 |  | 213.0 |  |
Pension [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 194.1 |  | 163.3 |  |
Pension [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 73.3 |  | 83.8 |  |
Pension [Member] | U.S. Large-cap [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 80.2 | [1] | 79.0 | [1] |
Pension [Member] | U.S. Large-cap [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 20.9 | [1] | 43.0 | [1] |
Pension [Member] | U.S. Large-cap [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 59.3 | [1] | 36.0 | [1] |
Pension [Member] | U.S. Large-cap [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0 | [1] | 0 | [1] |
Pension [Member] | U.S. Mid-cap Growth [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 36.1 | [1] | 33.6 | [1] |
Pension [Member] | U.S. Mid-cap Growth [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 9.4 | [1] | 18.3 | [1] |
Pension [Member] | U.S. Mid-cap Growth [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 26.7 | [1] | 15.3 | [1] |
Pension [Member] | U.S. Mid-cap Growth [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0 | [1] | 0 | [1] |
Pension [Member] | U.S. Small-cap [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 38.1 | [1] | 33.6 | [1] |
Pension [Member] | U.S. Small-cap [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 9.9 | [1] | 18.3 | [1] |
Pension [Member] | U.S. Small-cap [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 28.2 | [1] | 15.3 | [1] |
Pension [Member] | U.S. Small-cap [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0 | [1] | 0 | [1] |
Pension [Member] | International [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 104.7 |  | 96.4 |  |
Pension [Member] | International [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 61.2 |  | 50.5 |  |
Pension [Member] | International [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 43.5 |  | 45.9 |  |
Pension [Member] | International [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0 |  | 0 |  |
Pension [Member] | Mutual Funds [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 130.1 |  | 72.5 |  |
Pension [Member] | Mutual Funds [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 130.1 |  | 72.5 |  |
Pension [Member] | Mutual Funds [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0 |  | 0 |  |
Pension [Member] | Mutual Funds [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0 |  | 0 |  |
Pension [Member] | Fixed Income [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 36.4 |  | 61.2 |  |
Pension [Member] | Fixed Income [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0 |  | 10.4 |  |
Pension [Member] | Fixed Income [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 36.4 |  | 50.8 |  |
Pension [Member] | Fixed Income [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0 |  | 0 |  |
Pension [Member] | Cash Equivalents [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 2.7 |  |  |  |
Pension [Member] | Cash Equivalents [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 2.7 |  |  |  |
Pension [Member] | Cash Equivalents [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0 |  |  |  |
Pension [Member] | Cash Equivalents [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0 |  |  |  |
Pension [Member] | Private Equity Funds [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 46.8 |  | 58.9 |  |
Pension [Member] | Private Equity Funds [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0 |  | 0 |  |
Pension [Member] | Private Equity Funds [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0 |  | 0 |  |
Pension [Member] | Private Equity Funds [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 46.8 |  | 58.9 |  |
Pension [Member] | Real Estate [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 26.5 |  | 24.9 |  |
Pension [Member] | Real Estate [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0 |  | 0 |  |
Pension [Member] | Real Estate [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0 |  | 0 |  |
Pension [Member] | Real Estate [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 26.5 |  | 24.9 |  |
Postretirement Health and Life [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 157.0 |  | 131.0 |  | 121.0
Postretirement Health and Life [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 128.4 |  | 99.2 |  |
Postretirement Health and Life [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 15.5 |  | 18.3 |  |
Postretirement Health and Life [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 13.1 |  | 13.5 |  |
Postretirement Health and Life [Member] | U.S. Large-cap [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 28.3 | [2] | 16.7 | [2] |
Postretirement Health and Life [Member] | U.S. Large-cap [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 28.3 | [2] | 16.7 | [2] |
Postretirement Health and Life [Member] | U.S. Large-cap [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0 | [2] | 0 | [2] |
Postretirement Health and Life [Member] | U.S. Large-cap [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0 | [2] | 0 | [2] |
Postretirement Health and Life [Member] | U.S. Mid-cap Growth [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 17.6 | [2] | 13.2 | [2] |
Postretirement Health and Life [Member] | U.S. Mid-cap Growth [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 17.6 | [2] | 13.2 | [2] |
Postretirement Health and Life [Member] | U.S. Mid-cap Growth [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0 | [2] | 0 | [2] |
Postretirement Health and Life [Member] | U.S. Mid-cap Growth [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0 | [2] | 0 | [2] |
Postretirement Health and Life [Member] | U.S. Small-cap [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 18.2 | [2] | 13.3 | [2] |
Postretirement Health and Life [Member] | U.S. Small-cap [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 18.2 | [2] | 13.3 | [2] |
Postretirement Health and Life [Member] | U.S. Small-cap [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0 | [2] | 0 | [2] |
Postretirement Health and Life [Member] | U.S. Small-cap [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0 | [2] | 0 | [2] |
Postretirement Health and Life [Member] | International [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 33.4 |  | 30.3 |  |
Postretirement Health and Life [Member] | International [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 33.4 |  | 30.3 |  |
Postretirement Health and Life [Member] | International [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0 |  | 0 |  |
Postretirement Health and Life [Member] | International [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0 |  | 0 |  |
Postretirement Health and Life [Member] | Mutual Funds [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 30.8 |  | 25.5 |  |
Postretirement Health and Life [Member] | Mutual Funds [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 30.8 |  | 25.5 |  |
Postretirement Health and Life [Member] | Mutual Funds [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0 |  | 0 |  |
Postretirement Health and Life [Member] | Mutual Funds [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0 |  | 0 |  |
Postretirement Health and Life [Member] | Fixed Income [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 15.5 |  | 18.5 |  |
Postretirement Health and Life [Member] | Fixed Income [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0 |  | 0.2 |  |
Postretirement Health and Life [Member] | Fixed Income [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 15.5 |  | 18.3 |  |
Postretirement Health and Life [Member] | Fixed Income [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0 |  | 0 |  |
Postretirement Health and Life [Member] | Cash Equivalents [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0.1 |  |  |  |
Postretirement Health and Life [Member] | Cash Equivalents [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0.1 |  |  |  |
Postretirement Health and Life [Member] | Cash Equivalents [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0 |  |  |  |
Postretirement Health and Life [Member] | Cash Equivalents [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0 |  |  |  |
Postretirement Health and Life [Member] | Private Equity Funds [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 13.1 |  | 13.5 |  |
Postretirement Health and Life [Member] | Private Equity Funds [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0 |  | 0 |  |
Postretirement Health and Life [Member] | Private Equity Funds [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0 |  | 0 |  |
Postretirement Health and Life [Member] | Private Equity Funds [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | $ 13.1 |  | $ 13.5 |  |
[1] | The underlying investments classified under U.S. Equity Securities consist of money market funds (Level 1) and actively-managed funds (Level 2), which are combined with futures, and settle daily, to achieve the returns of the U.S. Equity Securities Large-cap, Mid-cap Growth, and Small-cap funds. Our exposure with respect to these investments includes both the futures and the underlying investments.
[2] | The underlying investments classified under U.S. Equity Securities consist of mutual funds (Level 1).

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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 Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: 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=29635418&loc=d3e12355-114930 + Details
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