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Retirement Plans and Other Investment Categories (Details 3) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
U.S. Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | $ 118.5 | $ 117.1 | $ 123.1
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets | 116.0 | 114.6 |
U.S. Pension Benefits | Fair Value, Inputs, Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 2.5 | 2.5 |
U.S. Pension Benefits | Fair Value, Inputs, Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 0.0 | 0.0 |
U.S. Pension Benefits | Cash, including money market funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 2.5 | 2.5 |
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets | 0.0 | 0.0 |
U.S. Pension Benefits | Cash, including money market funds | Fair Value, Inputs, Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 2.5 | 2.5 |
U.S. Pension Benefits | Cash, including money market funds | Fair Value, Inputs, Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 0.0 | 0.0 |
U.S. Pension Benefits | U.S. equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 27.6 | 28.6 |
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets | 27.6 | 28.6 |
U.S. Pension Benefits | U.S. equities | Fair Value, Inputs, Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 0.0 | 0.0 |
U.S. Pension Benefits | U.S. equities | Fair Value, Inputs, Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 0.0 | 0.0 |
U.S. Pension Benefits | Non-U.S. equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 8.7 | 8.7 |
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets | 8.7 | 8.7 |
U.S. Pension Benefits | Non-U.S. equities | Fair Value, Inputs, Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 0.0 | 0.0 |
U.S. Pension Benefits | Non-U.S. equities | Fair Value, Inputs, Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 0.0 | 0.0 |
U.S. Pension Benefits | U.S. corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 55.8 | 56.4 |
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets | 55.8 | 56.4 |
U.S. Pension Benefits | U.S. corporate bonds | Fair Value, Inputs, Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 0.0 | 0.0 |
U.S. Pension Benefits | U.S. corporate bonds | Fair Value, Inputs, Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 0.0 | 0.0 |
U.S. Pension Benefits | Non-U.S. corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 0.0 | 0.0 |
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets | 0.0 | 0.0 |
U.S. Pension Benefits | Non-U.S. corporate bonds | Fair Value, Inputs, Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 0.0 | 0.0 |
U.S. Pension Benefits | Non-U.S. corporate bonds | Fair Value, Inputs, Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 0.0 | 0.0 |
U.S. Pension Benefits | U.S. government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 16.4 | 12.7 |
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets | 16.4 | 12.7 |
U.S. Pension Benefits | U.S. government securities | Fair Value, Inputs, Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 0.0 | 0.0 |
U.S. Pension Benefits | U.S. government securities | Fair Value, Inputs, Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 0.0 | 0.0 |
U.S. Pension Benefits | Non-U.S. government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 0.6 | 0.3 |
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets | 0.6 | 0.3 |
U.S. Pension Benefits | Non-U.S. government securities | Fair Value, Inputs, Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 0.0 | 0.0 |
U.S. Pension Benefits | Non-U.S. government securities | Fair Value, Inputs, Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 0.0 | 0.0 |
U.S. Pension Benefits | Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 0.0 | 0.0 |
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets | 0.0 | 0.0 |
U.S. Pension Benefits | Real estate | Fair Value, Inputs, Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 0.0 | 0.0 |
U.S. Pension Benefits | Real estate | Fair Value, Inputs, Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 0.0 | 0.0 |
U.S. Pension Benefits | Other securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 6.9 | 7.9 |
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets | 6.9 | 7.9 |
U.S. Pension Benefits | Other securities | Fair Value, Inputs, Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 0.0 | 0.0 |
U.S. Pension Benefits | Other securities | Fair Value, Inputs, Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 0.0 | 0.0 |
Non-U.S. Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 121.2 | 108.3 | $ 111.2
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets | 0.0 | 0.0 |
Non-U.S. Pension Benefits | Fair Value, Inputs, Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 2.9 | 2.1 |
Non-U.S. Pension Benefits | Fair Value, Inputs, Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 118.3 | 106.2 |
Non-U.S. Pension Benefits | Cash, including money market funds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 2.9 | 2.1 |
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets | 0.0 | 0.0 |
Non-U.S. Pension Benefits | Cash, including money market funds | Fair Value, Inputs, Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 2.9 | 2.1 |
Non-U.S. Pension Benefits | Cash, including money market funds | Fair Value, Inputs, Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 0.0 | 0.0 |
Non-U.S. Pension Benefits | U.S. equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 6.4 | 5.9 |
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets | 0.0 | 0.0 |
Non-U.S. Pension Benefits | U.S. equities | Fair Value, Inputs, Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 0.0 | 0.0 |
Non-U.S. Pension Benefits | U.S. equities | Fair Value, Inputs, Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 6.4 | 5.9 |
Non-U.S. Pension Benefits | Non-U.S. equities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 24.4 | 21.2 |
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets | 0.0 | 0.0 |
Non-U.S. Pension Benefits | Non-U.S. equities | Fair Value, Inputs, Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 0.0 | 0.0 |
Non-U.S. Pension Benefits | Non-U.S. equities | Fair Value, Inputs, Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 24.4 | 21.2 |
Non-U.S. Pension Benefits | U.S. corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 0.6 | 0.9 |
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets | 0.0 | 0.0 |
Non-U.S. Pension Benefits | U.S. corporate bonds | Fair Value, Inputs, Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 0.0 | 0.0 |
Non-U.S. Pension Benefits | U.S. corporate bonds | Fair Value, Inputs, Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 0.6 | 0.9 |
Non-U.S. Pension Benefits | Non-U.S. corporate bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 19.3 | 17.7 |
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets | 0.0 | 0.0 |
Non-U.S. Pension Benefits | Non-U.S. corporate bonds | Fair Value, Inputs, Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 0.0 | 0.0 |
Non-U.S. Pension Benefits | Non-U.S. corporate bonds | Fair Value, Inputs, Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 19.3 | 17.7 |
Non-U.S. Pension Benefits | U.S. government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 0.0 | 0.6 |
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets | 0.0 | 0.0 |
Non-U.S. Pension Benefits | U.S. government securities | Fair Value, Inputs, Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 0.0 | 0.0 |
Non-U.S. Pension Benefits | U.S. government securities | Fair Value, Inputs, Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 0.0 | 0.6 |
Non-U.S. Pension Benefits | Non-U.S. government securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 32.7 | 29.3 |
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets | 0.0 | 0.0 |
Non-U.S. Pension Benefits | Non-U.S. government securities | Fair Value, Inputs, Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 0.0 | 0.0 |
Non-U.S. Pension Benefits | Non-U.S. government securities | Fair Value, Inputs, Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 32.7 | 29.3 |
Non-U.S. Pension Benefits | Real estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 3.5 | 2.8 |
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets | 0.0 | 0.0 |
Non-U.S. Pension Benefits | Real estate | Fair Value, Inputs, Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 0.0 | 0.0 |
Non-U.S. Pension Benefits | Real estate | Fair Value, Inputs, Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 3.5 | 2.8 |
Non-U.S. Pension Benefits | Other securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 31.4 | 27.8 |
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets | 0.0 | 0.0 |
Non-U.S. Pension Benefits | Other securities | Fair Value, Inputs, Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | 0.0 | 0.0 |
Non-U.S. Pension Benefits | Other securities | Fair Value, Inputs, Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total investments measured at fair value | $ 31.4 | $ 27.8 |

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