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Fair Value of Assets & Liabilities - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Segment Reporting Information [Line Items]              
Gain/(loss) on instrument specific credit risk           $ 0.3 $ 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      
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            
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 0.3 $ 0.8          
Disposition of Acquired Properties | Corporate              
Segment Reporting Information [Line Items]              
Asset impairment charges 0.8            
Reversed asset impairment charges $ 0.3