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Fair Value of Assets & Liabilities - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Segment Reporting Information [Line Items]                
Gain/(loss) on instrument specific credit risk $ 0.1       $ 0.0   $ 0.4 $ 0.3
Corporate                
Segment Reporting Information [Line Items]                
Asset impairment charges       $ 1.9 0.7 $ 1.3    
Reversed asset impairment charges       $ 0.5 $ 1.0      
Disposition of Acquired Properties | Corporate                
Segment Reporting Information [Line Items]                
Asset impairment charges 2.4 $ 0.8            
Reversed asset impairment charges 0.4 0.3            
Leased Assets | Corporate                
Segment Reporting Information [Line Items]                
Asset impairment charges   1.5            
Leased Assets | 2019 Business Optimization | Corporate                
Segment Reporting Information [Line Items]                
Asset impairment charges 1.0 0.3 $ 0.8          
Reversed asset impairment charges $ 0.7              
Long Lived Tangible Assets | 2019 Business Optimization | Corporate                
Segment Reporting Information [Line Items]                
Asset impairment charges   11.4 $ 0.5          
Long Lived Tangible Assets | Rebranding Initiative | Corporate                
Segment Reporting Information [Line Items]                
Asset impairment charges   $ 7.1