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Retirement Plans and Post Retirement Benefits Asset Allocation and Fair Value of Plan Assets (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | $ 274.8 |  | $ 265.9 |  | $ 239.9
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 101.5 |  | 147.5 |  |
Fair Value, Inputs, Level 2 |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 160.6 |  | 105.5 |  |
Significant Unobservable Inputs (Level 3) |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 12.7 |  | 12.9 |  |
Domestic stock funds |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | [1] | 22.3 |  | 56.2 |  |
Domestic stock funds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | [1] | 22.3 |  | 42.2 |  |
Domestic stock funds | Fair Value, Inputs, Level 2 |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | [1] | 0.0 |  | 14.0 |  |
Domestic stock funds | Significant Unobservable Inputs (Level 3) |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | [1] | 0.0 |  | 0.0 |  |
International stock funds |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | [1] | 13.2 |  | 43.1 |  |
International stock funds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | [1] | 13.2 |  | 15.5 |  |
International stock funds | Fair Value, Inputs, Level 2 |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | [1] | 0.0 |  | 27.6 |  |
International stock funds | Significant Unobservable Inputs (Level 3) |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | [1] | 0.0 |  | 0.0 |  |
Domestic bond funds |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 27.1 | [2] | 40.2 | [1] |
Domestic bond funds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | [1] | 27.1 |  | 20.2 |  |
Domestic bond funds | Fair Value, Inputs, Level 2 |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | [1] | 0.0 |  | 20.0 |  |
Domestic bond funds | Significant Unobservable Inputs (Level 3) |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | [1] | 0.0 |  | 0.0 |  |
International bond funds |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | [2] | 27.3 |  | 40.9 |  |
International bond funds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | [1] |  |  | 0.0 |  |
International bond funds | Fair Value, Inputs, Level 2 |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | [1] | 27.3 |  | 40.9 |  |
International bond funds | Significant Unobservable Inputs (Level 3) |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | [1] |  |  | 0.0 |  |
Multi-strategy Funds |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 35.0 |  | 82.5 | [3] |
Multi-strategy Funds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 35.0 |  | 69.6 | [3] |
Multi-strategy Funds | Fair Value, Inputs, Level 2 |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 0.0 |  | 0.0 | [3] |
Multi-strategy Funds | Significant Unobservable Inputs (Level 3) |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 0.0 |  | 12.9 | [3] |
Cash and Cash Equivalents |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 1.5 |  | 3.0 |  |
Cash and Cash Equivalents | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 0.0 |  | 0.0 |  |
Cash and Cash Equivalents | Fair Value, Inputs, Level 2 |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 1.5 |  | 3.0 |  |
Cash and Cash Equivalents | Significant Unobservable Inputs (Level 3) |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | $ 0.0 |  | $ 0.0 |  |
UNITED STATES |  |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |  |
Target Plan Asset Allocation 2018 |  | 100.00% |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocation |  | 100.00% |  | 100.00% |  |
UNITED STATES | Equity Securities |  |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |  |
Target Plan Asset Allocation 2018 |  | 33.00% |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocation |  | 26.00% |  | 40.00% |  |
UNITED STATES | Debt Securities |  |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |  |
Target Plan Asset Allocation 2018 |  | 50.00% |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocation |  | 52.00% |  | 20.00% |  |
UNITED STATES | Multi-strategy Funds |  |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |  |
Target Plan Asset Allocation 2018 |  | 17.00% |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocation |  | 22.00% |  | 40.00% |  |
Non-US [Member] |  |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |  |
Target Plan Asset Allocation 2018 |  | 100.00% |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocation |  | 100.00% |  | 100.00% |  |
Non-US [Member] | Equity Securities |  |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |  |
Target Plan Asset Allocation 2018 |  | 0.00% |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocation |  | 0.00% |  | 28.00% |  |
Non-US [Member] | Debt Securities |  |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |  |
Target Plan Asset Allocation 2018 |  | 90.00% |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocation |  | 90.00% |  | 70.00% |  |
Non-US [Member] | Cash and Cash Equivalents |  |  |  |  |  |
Target Allocations [Abstract] |  |  |  |  |  |
Target Plan Asset Allocation 2018 |  | 10.00% |  |  |  |
Defined Benefit Plan, Actual Plan Asset Allocation |  | 10.00% |  | 2.00% |  |
Net Asset Value, previously Level 1 [Member] [Member] | Domestic stock funds |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | [1] | $ 0.0 |  |  |  |
Net Asset Value, previously Level 1 [Member] [Member] | International stock funds |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | [1] |  |  |  |  |
Net Asset Value, previously Level 1 [Member] [Member] | Domestic bond funds |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 3.9 |  |  |  |
Net Asset Value, previously Level 1 [Member] [Member] | International bond funds |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 0.0 |  |  |  |
Net Asset Value, previously Level 1 [Member] [Member] | Multi-strategy Funds |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | [1] | 0.0 |  |  |  |
Net Asset Value, previously Level 2 [Member] | Domestic stock funds |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | [1] | 8.3 |  |  |  |
Net Asset Value, previously Level 2 [Member] | International stock funds |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | [1] | 13.7 |  |  |  |
Net Asset Value, previously Level 2 [Member] | Domestic bond funds |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 84.6 |  |  |  |
Net Asset Value, previously Level 2 [Member] | International bond funds |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 20.1 |  |  |  |
Net Asset Value, previously Level 2 [Member] | Multi-strategy Funds |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | [1] | 5.1 |  |  |  |
Net Asset Value, previously Level 3 [Member] | Domestic stock funds |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | [1] | 0.0 |  |  |  |
Net Asset Value, previously Level 3 [Member] | International stock funds |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | [1] |  |  |  |  |
Net Asset Value, previously Level 3 [Member] | Domestic bond funds |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  |  |  |  |  |
Net Asset Value, previously Level 3 [Member] | International bond funds |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 0.0 |  |  |  |
Net Asset Value, previously Level 3 [Member] | Multi-strategy Funds |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 12.7 | [1] | $ 12.9 |  | $ 12.2
Net Asset Value [Member] | Domestic stock funds |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | [1] | 8.3 |  |  |  |
Net Asset Value [Member] | International stock funds |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | [1] | 13.7 |  |  |  |
Net Asset Value [Member] | Domestic bond funds |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | [1] | 88.5 |  |  |  |
Net Asset Value [Member] | International bond funds |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | [1] | 20.1 |  |  |  |
Net Asset Value [Member] | Multi-strategy Funds |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | [2] | $ 17.8 |  |  |  |
[1] | Equity investments include investments in funds that are primarily invested in large capitalization U.S. and international equity securities and a mutual fund.
[2] | Fixed income investments include investments in funds that are primarily invested in a diversified portfolio of investment grade U.S. and international debt securities.
[3] | The multi-strategy funds invest in various hedge funds that employ a fund of funds strategy.

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