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Goodwill and Other Intangibles (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Acquired Finite-Lived Intangible Assets [Line Items]        
Amortization expense related to other intangible assets     $ 8.3 $ 8.3
Other Intangible Assets        
Acquired Finite-Lived Intangible Assets [Line Items]        
Amortization expense related to other intangible assets $ 4.2 $ 4.1 8.3 $ 8.3
Estimated future amortization expense for 2020 8.3   8.3  
Estimated future amortization expense for 2021 14.3   14.3  
Estimated future amortization expense for 2022 9.7   9.7  
Estimated future amortization expense for 2023 9.5   9.5  
Estimated future amortization expense for 2024 $ 9.3   $ 9.3