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Recent Accounting Pronouncements (Recently Adopted Accounting Standards) (Lease Accounting) (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
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Accounting Policies [Abstract] |  |  |
Lease right-of-use asset, net | $ 12,325.2 | $ 12,500.0 | $ 0.0

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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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