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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 |  |

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