Goodwill and Intangible Assets - Government Grants (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets
Gross carrying amount	$ 294.9	$ 295.0
Government grants
Finite-Lived Intangible Assets
Gross carrying amount	8.6	9.2
Government grants \| Current
Finite-Lived Intangible Assets
Gross carrying amount	0.5	0.5
Government grants \| Long-term
Finite-Lived Intangible Assets
Gross carrying amount	$ 8.1	$ 8.7

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

Name:	us-gaap_FiniteLivedIntangibleAssetsGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant