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Basis of Presentation (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Jan. 01, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Gain (Loss) on Extinguishment of Debt   $ 0.0 $ (15.7)    
Operating lease, liability $ 205.8 205.8      
Operating ROU assets 203.3 $ 203.3     $ 0.0
Accounting Standards Update 2016-02          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Operating lease, liability       $ 194.2  
Operating ROU assets       $ 196.4  
Reclassification Statement of Cash Flows [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Gain (Loss) on Extinguishment of Debt $ 15.7