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Impact of Recently Issued Accounting Guidance (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Jan. 01, 2019
Impact of Recently Issued Accounting Standards-Not Yet Adopted    
Operating lease right-of-use assets $ 198.9  
Operating lease liability $ 199.9  
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