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Basis of Presentation and Implementation of New Financial Accounting Standards (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Mar. 11, 2019
Jan. 01, 2019
Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Operating lease assets $ 546.5   $ 530.0  
Reclassification of deferred rent net of prepaid rent, as a component of the operating lease asset (286.4)     $ (298.7)
Operating lease liabilities $ 621.9   595.0  
Discontinued Operations, Disposed of by Sale | Elanco Animal Health Incorporated        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Noncontrolling interest, ownership percentage by parent   80.20%    
Accounting Standards Update 2016-02        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Reclassification of deferred rent net of prepaid rent, as a component of the operating lease asset     $ 65.0