Annual report pursuant to Section 13 and 15(d)

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

v3.24.0.1
Income Taxes, Tax Credits and Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Tax Disclosure [Abstract]      
Gross Unrecognized Tax Benefits, Including Interest $ 9.3 $ 7.8 $ 10.1
Reconciliation of the total amounts of unrecognized tax benefits [Roll Forward]      
Balance at January 1 7.5 9.7 3.7
Gross Increases - Tax Positions Prior Periods 0.9 0.5 5.9
Gross Decreases - Tax Positions Prior Periods 0.0 (2.1) (0.2)
Gross Increases - Current Period Tax Positions 0.0 0.0 0.5
Decreases - Settlements with Taxing Authorities 0.0 (0.6) (0.2)
Balance at December 31 8.4 7.5 9.7
Possible Decrease in Unrecognized Tax Benefits in 2017 2.1    
Tax Credit Carryforward [Line Items]      
Tax Credit Carryforward, Amount 56.1    
Tax Credit Carryforwards 56.1 52.9  
Gross Unrecognized Tax Benefits, Including Interest 9.3 7.8 10.1
Income Tax Provision 196.3 $ 172.3 141.0
Deferred Tax Assets, Tax Credit Carryforwards, Foreign 1.1    
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 6.6    
State Tax Credits [Member]      
Tax Credit Carryforward [Line Items]      
Tax Credit Carryforwards $ 48.4