XML 65 R51.htm IDEA: XBRL DOCUMENT v3.20.2
Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Operating Loss Carryforwards [Line Items]        
Effective income tax rate 53.50% (31.70%) 10.80% 5.40%
Income Tax Benefit Offset Amount From Cares Act 2020 Aid $ 106.0   $ 206.0  
Net operating losses carried back term due to cares act     5 years  
Favorably impacted by an income tax benefit 90.3   $ 90.3  
Income tax receivable recorded in current assets 112.0   112.0  
Income tax receivable recorded in other assets $ 90.3   $ 90.3