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Summary of Significant Accounting Policies, Income Taxes (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2018
Income tax |  |
Undistributed foreign earnings | $ 900.0 |
Income tax expense (benefit) |  | $ (14.5)
GILTI policy | Tax as incurred |

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- Definition Amount of income tax expense (benefit) from effect of Tax Cuts and Jobs Act. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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