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Summary of Significant Accounting Policies - Impact of Recently Issued Accounting Standards (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Jan. 01, 2019
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Impact of Recently Issued Accounting Standards-Adopted |  |
Operating lease right-of-use assets | $ 201.5 |
Operating lease liability | $ 202.0 |
Restated Amount | ASU 2016-02 Leases |  |
Impact of Recently Issued Accounting Standards-Adopted |  |
Operating lease right-of-use assets |  | $ 186.3
Operating lease liability |  | $ 187.1

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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