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Recent Accounting Pronouncements New Accounting Standards - Effect of change related to ASU 2014-09 (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Assets [Abstract] |  |  |
Accounts receivable, net | $ 33.8 | $ 27.8 | $ 49.6
Other assets | (17.5) | (12.5) | (13.6)
Liabilities [Abstract] |  |  |
Accrued expense | 83.0 | 76.6 | 75.8
Income taxes payable | 0.5 |  | 0.0
Deferred revenue | (12.8) | (52.0) | (70.9)
Deferred revenue | (21.1) | (24.8) | (29.3)
Deferred income taxes | 66.4 | 40.5 | 40.6
Equity [Abstract] |  |  |
Retained earnings | $ 504.1 | $ 664.0 | $ 634.3

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- Definition Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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