Annual report pursuant to Section 13 and 15(d)

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

v3.22.0.1
Income Taxes, Tax Credits and Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]        
Gross Unrecognized Tax Benefits, Including Interest $ 10.1 $ 10.1 $ 4.1 $ 3.9
Reconciliation of the total amounts of unrecognized tax benefits [Roll Forward]        
Balance at January 1   3.7 3.7 2.3
Gross Increases - Tax Positions Prior Periods   5.9 0.1 2.0
Gross Decreases - Tax Positions Prior Periods   (0.2) 0.0 (0.8)
Gross Increases - Current Period Tax Positions   0.5 0.6 0.4
Decreases - Settlements with Taxing Authorities   (0.2) (0.1) 0.0
Reductions - Lapse of Statute of Limitations   0.0 (0.6) (0.2)
Balance at December 31 9.7 9.7 3.7 3.7
Possible Decrease in Unrecognized Tax Benefits in 2017 0.5 0.5    
Tax Credit Carryforward [Line Items]        
Tax Credit Carryforward, Amount 57.6 57.6    
Tax Credit Carryforwards 57.6 57.6 51.1  
Gross Unrecognized Tax Benefits, Including Interest 10.1 10.1 4.1 3.9
Income Tax Provision   141.0 $ 98.0 $ 80.3
SEC Schedule, 12-09, Valuation Allowance, Tax Credit Carryforward        
Tax Credit Carryforward [Line Items]        
Income Tax Provision (21.0)      
Acquisition-related Costs        
Income Tax Disclosure [Abstract]        
Gross Unrecognized Tax Benefits, Including Interest 5.5 5.5    
Tax Credit Carryforward [Line Items]        
Gross Unrecognized Tax Benefits, Including Interest 5.5 5.5    
General Business Credits [Member]        
Tax Credit Carryforward [Line Items]        
Tax Credit Carryforwards 12.9 12.9    
State Tax Credits [Member]        
Tax Credit Carryforward [Line Items]        
Tax Credit Carryforwards $ 44.7 $ 44.7