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Impact of Recently Issued Accounting Guidance (Details) - USD ($) $ in Millions	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Impact of Recently Issued Accounting Standards—Not Yet Adopted
Operating lease right-of-use assets	$ 185.0
Operating lease liability	$ 186.4		$ 217.5
Restated Amount | ASU 2016-02 Leases
Impact of Recently Issued Accounting Standards—Not Yet 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
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Amount of lessee's right to use underlying asset under operating lease.

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-Name Accounting Standards Codification
-Topic 842
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