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Share-Based Compensation Plans - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |  |  |
Share-based compensation expense | $ 5.9 | $ 6.7 | $ 18.8 | $ 19.5
Consideration received from share-based awards |  |  | $ 6.3 | $ 4.7

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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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