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Retirement Benefit Plans - Funded status of plans with ABO in excess of plan assets (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Accumulated benefit obligation | $ (649.9) | $ (681.2)
Plan assets | 449.9 | 494.8
Funded status of plan | (200.0) | (186.4)
Germany |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Funded status of plan | (95.4) | (75.7)
United States |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Funded status of plan | (37.1) | (43.2)
Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Funded status of plan | $ (67.5) | $ (67.5)

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- Definition Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920 + Details
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