Income Tax Matters, Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income tax provision	$ 9.6	$ 9.8
Effective tax rate (percent)	25.00%	26.00%
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Amount		$ (0.5)
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Percent		1.00%
Effective tax rate reconciliation, increase (decrease) to the valuation allowance for certain state net operating losses		$ 0.7
Effective tax rate reconciliation, increase (decrease) to the valuation allowance for certain state net operating losses (percent)		2.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount		$ 0.4
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent		1.00%
Gross unrecognized tax benefits	$ 3.9		$ 4.1
Gross unrecognized tax benefits that would impact effective tax rate	$ 0.4		$ 0.9