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Fair Value of Assets & Liabilities - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 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    
Leased Assets | 2019 Business Optimization | Corporate          
Segment Reporting Information [Line Items]          
Asset impairment charges 0.8        
Long Lived Tangible Assets | 2019 Business Optimization | Corporate          
Segment Reporting Information [Line Items]          
Asset impairment charges $ 0.5