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Accounting Changes - Narrative (Details) - USD ($)
$ in Millions
Oct. 01, 2018
Oct. 01, 2019
ASU 2018-02    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Tax Cuts and Jobs Act of 2017, reclassification from AOCI to retained earnings, tax effect $ 6.6  
Minimum | Forecast | Subsequent Event | ASU 2016-02    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Operating lease, right-of-use asset   $ 400.0
Operating lease, liability   400.0
Maximum | Forecast | Subsequent Event | ASU 2016-02    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Operating lease, right-of-use asset   600.0
Operating lease, liability   $ 600.0