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Revenue Recognition - Contract Balances (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Change in Contract with Customer, Liability [Abstract] |  |  |
Balance as of January 1 | $ 247.4 | $ 227.4 | $ 215.8
Revenue recognized | (68.4) | (69.1) | (79.5)
Revenue deferred | 89.3 | 87.6 | 90.5
Acquired liabilities | 0.0 | 1.5 | 0.6
Balance as of December 31 | 268.3 | 247.4 | 227.4
Change in Contract with Customer, Asset [Abstract] |  |  |
Balance as of December 31 | 84.5 | 100.5 | 44.7
Contract assets | (16.0) | 55.8 | 44.7
Balance as of January 1 | 100.5 | 44.7 | 0.0
Revenue recognized and unbilled | (13.3) | 26.7 | 21.9
Acquired assets | (3.3) | $ 29.1 |
Currency translation and other | $ 0.6 |  |
Adoption of ASC 606 |  |  | $ 22.8

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- Definition Contract with Customer, Asset, Increase (Decrease) for Currency Translation and Other + References No definition available. + Details
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- Definition Contract with Customer, Asset, Adoption of ASC 606 + References No definition available. + Details
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- Definition Contract with Customer, Asset, Revenue Recognized + References No definition available. + Details
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- Definition Amount, before allowance for credit loss, of right to consideration in exchange for good or service transferred to customer, when right is conditioned on something other than passage of time. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130533-203044 + Details
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