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Share-based compensation (Expected share-based compensation expense) (Details) $ in Millions | Dec. 31, 2017 USD ($)
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2018 |
Unrecognized Share-Based Compensation, Expected Period Of Recognition [Line Items] |
Expected share-based compensation expense | $ 75.5
2019 |
Unrecognized Share-Based Compensation, Expected Period Of Recognition [Line Items] |
Expected share-based compensation expense | 36.0
2020 |
Unrecognized Share-Based Compensation, Expected Period Of Recognition [Line Items] |
Expected share-based compensation expense | 19.0
2021 |
Unrecognized Share-Based Compensation, Expected Period Of Recognition [Line Items] |
Expected share-based compensation expense | $ 4.7

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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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