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Income Taxes (Narratives) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]      
Retained earnings $ 926.3 $ 744.7  
U.S. federal statutory tax rate 21.00% 21.00% 21.00%
Deferred Tax Assets, Operating Loss Carryforwards, Foreign $ 1.7    
Deferred Tax Assets, Operating Loss Carryforwards, Domestic 0.0    
Gross deferred tax assets 80.5 $ 58.3  
Gross deferred tax liabilities 188.7 156.2  
Deferred Tax Assets, Valuation Allowance 0.5 0.8  
Unrecognized Tax Benefits 1.3 $ 1.3 $ 0.4
Foreign [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Retained earnings $ 29.5