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Pension and Other Postretirement Benefit Plans - Recurring Fair Value Measures (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
Pension [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | $ 521.3 |  | $ 544.2 |  | $ 501.6
Pension [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 144.1 |  | 120.4 |  |
Pension [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 305.0 |  | 351.6 |  |
Pension [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 72.2 |  | 72.2 |  |
Pension [Member] | U.S. Large-cap [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 76.0 | [1] | 88.5 | [2] |
Pension [Member] | U.S. Large-cap [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 33.9 | [1] | 32.1 | [2] |
Pension [Member] | U.S. Large-cap [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 42.1 | [1] | 56.4 | [2] |
Pension [Member] | U.S. Large-cap [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0.0 | [1] | 0.0 | [2] |
Pension [Member] | U.S. Mid-cap Growth [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 31.9 | [1] | 37.5 | [2] |
Pension [Member] | U.S. Mid-cap Growth [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 14.2 | [1] | 13.6 | [2] |
Pension [Member] | U.S. Mid-cap Growth [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 17.7 | [1] | 23.9 | [2] |
Pension [Member] | U.S. Mid-cap Growth [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0.0 | [1] | 0.0 | [2] |
Pension [Member] | U.S. Small-cap [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 32.4 | [1] | 38.3 | [2] |
Pension [Member] | U.S. Small-cap [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 14.5 | [1] | 13.9 | [2] |
Pension [Member] | U.S. Small-cap [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 17.9 | [1] | 24.4 | [2] |
Pension [Member] | U.S. Small-cap [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0.0 | [1] | 0.0 | [2] |
Pension [Member] | Mutual Funds [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 8.4 |  |  |  |
Pension [Member] | Mutual Funds [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 8.4 |  |  |  |
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] | International [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 86.7 |  | 92.0 |  |
Pension [Member] | International [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 44.7 |  | 46.1 |  |
Pension [Member] | International [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 42.0 |  | 45.9 |  |
Pension [Member] | International [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0.0 |  | 0.0 |  |
Pension [Member] | Debt Securities - Mutual Funds [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0.1 |  | 0.1 |  |
Pension [Member] | Debt Securities - Mutual Funds [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0.1 |  | 0.1 |  |
Pension [Member] | Debt Securities - Mutual Funds [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0.0 |  | 0.0 |  |
Pension [Member] | Debt Securities - Mutual Funds [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0.0 |  | 0.0 |  |
Pension [Member] | Debt Securities - Fixed Income [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 188.0 |  | 203.7 |  |
Pension [Member] | Debt Securities - Fixed Income [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 2.7 |  | 2.7 |  |
Pension [Member] | Debt Securities - Fixed Income [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 185.3 |  | 201.0 |  |
Pension [Member] | Debt Securities - Fixed Income [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0.0 |  | 0.0 |  |
Pension [Member] | Cash and Cash Equivalents [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 25.6 |  | 11.9 |  |
Pension [Member] | Cash and Cash Equivalents [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 25.6 |  | 11.9 |  |
Pension [Member] | Cash and Cash Equivalents [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0.0 |  | 0.0 |  |
Pension [Member] | Cash and Cash Equivalents [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0.0 |  | 0.0 |  |
Pension [Member] | Private Equity Funds [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 43.3 |  | 43.3 |  |
Pension [Member] | Private Equity Funds [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0.0 |  | 0.0 |  |
Pension [Member] | Private Equity Funds [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0.0 |  | 0.0 |  |
Pension [Member] | Private Equity Funds [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 43.3 |  | 43.3 |  |
Pension [Member] | Real Estate [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 28.9 |  | 28.9 |  |
Pension [Member] | Real Estate [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0.0 |  | 0.0 |  |
Pension [Member] | Real Estate [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0.0 |  | 0.0 |  |
Pension [Member] | Real Estate [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 28.9 |  | 28.9 |  |
Postretirement Health and Life [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 153.4 |  | 163.2 |  | $ 157.0
Postretirement Health and Life [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 133.0 |  | 140.4 |  |
Postretirement Health and Life [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 8.4 |  | 9.9 |  |
Postretirement Health and Life [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 12.0 |  | 12.9 |  |
Postretirement Health and Life [Member] | U.S. Large-cap [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 28.2 | [3] | 29.3 | [4] |
Postretirement Health and Life [Member] | U.S. Large-cap [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 28.2 | [3] | 29.3 | [4] |
Postretirement Health and Life [Member] | U.S. Large-cap [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0.0 | [3] | 0.0 | [4] |
Postretirement Health and Life [Member] | U.S. Large-cap [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0.0 | [3] | 0.0 | [4] |
Postretirement Health and Life [Member] | U.S. Mid-cap Growth [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 19.1 | [3] | 20.0 | [4] |
Postretirement Health and Life [Member] | U.S. Mid-cap Growth [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 19.1 | [3] | 20.0 | [4] |
Postretirement Health and Life [Member] | U.S. Mid-cap Growth [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0.0 | [3] | 0.0 | [4] |
Postretirement Health and Life [Member] | U.S. Mid-cap Growth [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0.0 | [3] | 0.0 | [4] |
Postretirement Health and Life [Member] | U.S. Small-cap [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 12.1 | [3] | 12.6 | [4] |
Postretirement Health and Life [Member] | U.S. Small-cap [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 12.1 | [3] | 12.6 | [4] |
Postretirement Health and Life [Member] | U.S. Small-cap [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0.0 | [3] | 0.0 | [4] |
Postretirement Health and Life [Member] | U.S. Small-cap [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0.0 | [3] | 0.0 | [4] |
Postretirement Health and Life [Member] | International [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 26.8 |  | 30.6 |  |
Postretirement Health and Life [Member] | International [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 26.8 |  | 30.6 |  |
Postretirement Health and Life [Member] | International [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0.0 |  | 0.0 |  |
Postretirement Health and Life [Member] | International [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0.0 |  | 0.0 |  |
Postretirement Health and Life [Member] | Debt Securities - Mutual Funds [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 45.2 |  | 44.5 |  |
Postretirement Health and Life [Member] | Debt Securities - Mutual Funds [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 45.2 |  | 44.5 |  |
Postretirement Health and Life [Member] | Debt Securities - Mutual Funds [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0.0 |  | 0.0 |  |
Postretirement Health and Life [Member] | Debt Securities - Mutual Funds [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0.0 |  | 0.0 |  |
Postretirement Health and Life [Member] | Debt Securities - Fixed Income [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 8.4 |  | 9.9 |  |
Postretirement Health and Life [Member] | Debt Securities - Fixed Income [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0.0 |  | 0.0 |  |
Postretirement Health and Life [Member] | Debt Securities - Fixed Income [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 8.4 |  | 9.9 |  |
Postretirement Health and Life [Member] | Debt Securities - Fixed Income [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0.0 |  | 0.0 |  |
Postretirement Health and Life [Member] | Cash and Cash Equivalents [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 1.6 |  | 3.4 |  |
Postretirement Health and Life [Member] | Cash and Cash Equivalents [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 1.6 |  | 3.4 |  |
Postretirement Health and Life [Member] | Cash and Cash Equivalents [Member] | Level 2 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0.0 |  | 0.0 |  |
Postretirement Health and Life [Member] | Cash and Cash Equivalents [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0.0 |  | 0.0 |  |
Postretirement Health and Life [Member] | Private Equity Funds [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 12.0 |  | 12.9 |  |
Postretirement Health and Life [Member] | Private Equity Funds [Member] | Level 1 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | 0.0 |  | 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 |  | 0.0 |  |
Postretirement Health and Life [Member] | Private Equity Funds [Member] | Level 3 [Member] |  |  |  |  |
Recurring Fair Value Measures [Line Items] |  |  |  |  |
Fair Value of Assets | $ 12.0 |  | $ 12.9 |  |
[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 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.
[3] | The underlying investments classified under U.S. Equity Securities consist of mutual funds (Level 1).
[4] | The underlying investments classified under U.S. Equity Securities consist of mutual funds (Level 1).

X
- 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 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: 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=58740216&loc=d3e1928-114920 + Details
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