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New Accounting Standards Narrative (Details)
$ in Millions
Jun. 30, 2019
USD ($)
Mar. 31, 2019
leases
Jan. 01, 2019
USD ($)
Dec. 31, 2018
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Number of leases | leases   23,600    
Operating lease liability $ 1,383.0   $ 1,200.0  
Right-of-use operating lease asset $ 1,389.0   1,200.0 $ 0.0
Net Assets     1,300.0  
Cumulative effect of a new accounting standard     $ 24.8 $ (24.8)