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Income Tax Matters, Provision Table (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Tax Provision        
Domestic $ 6.8 $ 7.5 $ 16.3 $ 13.1
Foreign 0.5 0.3 0.8 0.6
Total $ 7.3 $ 7.8 $ 17.1 $ 13.7