Annual report pursuant to Section 13 and 15(d)

Income Taxes, Tax Credits and Unrecognized Tax Benefits (Details)

v3.22.4
Income Taxes, Tax Credits and Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income Tax Disclosure [Abstract]        
Gross Unrecognized Tax Benefits, Including Interest $ 7.8 $ 7.8 $ 10.1 $ 4.1
Reconciliation of the total amounts of unrecognized tax benefits [Roll Forward]        
Balance at January 1   9.7 3.7 3.7
Gross Increases - Tax Positions Prior Periods   0.5 5.9 0.1
Gross Decreases - Tax Positions Prior Periods   (2.1) (0.2) 0.0
Gross Increases - Current Period Tax Positions   0.0 0.5 0.6
Decreases - Settlements with Taxing Authorities   (0.6) (0.2) (0.1)
Reductions - Lapse of Statute of Limitations   0.0 0.0 (0.6)
Balance at December 31 7.5 7.5 9.7 3.7
Possible Decrease in Unrecognized Tax Benefits in 2017 0.2 0.2    
Tax Credit Carryforward [Line Items]        
Tax Credit Carryforward, Amount 52.9 52.9    
Tax Credit Carryforwards 52.9 52.9 57.6  
Gross Unrecognized Tax Benefits, Including Interest 7.8 7.8 10.1 4.1
Income Tax Provision   172.3 $ 141.0 $ 98.0
SEC Schedule, 12-09, Valuation Allowance, Tax Credit Carryforward        
Tax Credit Carryforward [Line Items]        
Income Tax Provision (21.0)      
General Business Credits [Member]        
Tax Credit Carryforward [Line Items]        
Tax Credit Carryforwards 5.7 5.7    
State Tax Credits [Member]        
Tax Credit Carryforward [Line Items]        
Tax Credit Carryforwards $ 47.2 $ 47.2