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Fair Value Measurements - Defined Benefit Plan Assets (Details) - Pension Plan [Member] - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
United States |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 240.1 | $ 229.5 | $ 235.8
United States | Fair Value, Measurements, Recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 240.1 | 229.5 |
United States | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 34.7 | 65.6 |
United States | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0.4 | 0.5 |
United States | Fixed Income Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 127.1 | 113.8 |
United States | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 86.7 | 94.2 |
United States | Real estate and other | Fair Value, Measurements, Recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 26.3 | 21.5 |
United States | Market Approach Valuation Technique [Member] | Fixed Income Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 1.3 | 15.3 |
United States | Market Approach Valuation Technique [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 13.5 | 37.2 |
United States | Market Approach Valuation Technique [Member] | Real estate and other | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 19.9 | 13.1 |
United States | Market Approach Valuation Technique [Member] | Real estate and other | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0.4 | 0.5 |
United States | Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 205.0 | 163.4 |
United States | Net Asset Value [Member] | Fixed Income Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 125.8 | 98.5 |
United States | Net Asset Value [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 73.2 | 57.0 |
United States | Net Asset Value [Member] | Real estate and other | Fair Value, Measurements, Recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 6.0 | 7.9 |
Non-US [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 483.4 | 393.8 | $ 395.1
Non-US [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 483.4 | 393.8 |
Non-US [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 105.4 | 87.1 |
Non-US [Member] | Fixed Income Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 212.4 | 183.4 |
Non-US [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 233.9 | 190.8 |
Non-US [Member] | Real estate and other | Fair Value, Measurements, Recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 37.1 | 19.6 |
Non-US [Member] | Market Approach Valuation Technique [Member] | Fixed Income Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  |  |
Non-US [Member] | Market Approach Valuation Technique [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 105.4 | 87.1 |
Non-US [Member] | Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 378.0 | 306.7 |
Non-US [Member] | Net Asset Value [Member] | Fixed Income Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 212.4 | 183.4 |
Non-US [Member] | Net Asset Value [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 128.5 | 103.7 |
Non-US [Member] | Net Asset Value [Member] | Real estate and other | Fair Value, Measurements, Recurring [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 37.1 | $ 19.6 |

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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + 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=82843861&loc=d3e1928-114920 + Details
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