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Retirement Benefit Plans Retirement Benefit Plans - Funded status of plans with ABO in excess of plan assets (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated benefit obligation | $ (594.0) | $ (597.6)
Plan assets | 423.3 | 431.0
Funded status of plan | (170.7) | (166.6)
Non-U.S. Plans: |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Funded status of plan | (134.4) | (113.4)
Germany |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Funded status of plan | (77.5) | (64.3)
United States |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Funded status of plan | (53.0) | (64.9)
Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Funded status of plan | $ (40.2) | $ (37.4)

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- Definition The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total. + 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 (c) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 + Details
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