Annual report pursuant to Section 13 and 15(d)

Income Taxes (Narrative) (Details)

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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2013
Tax Credit Carryforward [Line Items]        
Tax cuts and jobs act, change in tax rate, deferred tax liability, income tax benefit $ 66.9      
Liability for uncertainty in income taxes       $ 10.1
Increase (decrease) in unrecognized tax benefits $ (2.0)      
State and Local Jurisdiction        
Tax Credit Carryforward [Line Items]        
Operating loss carryforwards, valuation allowance   $ 4.2 $ 4.0