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Goodwill and Other Intangibles (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Acquired Finite-Lived Intangible Assets [Line Items]          
Amortization expense related to other intangible assets       $ 8.3 $ 8.9
Other Intangible Assets          
Acquired Finite-Lived Intangible Assets [Line Items]          
Amortization expense related to other intangible assets $ 4.1   $ 4.4 8.3 $ 8.9
Estimated future amortization expense for 2019 8.4     8.4  
Estimated future amortization expense for 2020 16.8     16.8  
Estimated future amortization expense for 2021 14.4     14.4  
Estimated future amortization expense for 2022 9.8     9.8  
Estimated future amortization expense for 2023 $ 9.5     $ 9.5  
BEx LLC          
Acquired Finite-Lived Intangible Assets [Line Items]          
Consideration transferred   $ 37.9      
Goodwill acquired   12.5      
Software intangible assets acquired   $ 25.0