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Income Taxes - Net Operating Losses Carryforwards (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Federal [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | $ 1,572.9 | $ 1,519.9
State [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | 1,090.7 | 1,068.3
Foreign [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Operating loss carryforwards | $ 229.4 | $ 306.8

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
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