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Investment in Unconsolidated Affiliate Summarized Balance Sheet Information of Equity Method Investment (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Summarized Financial Information of Equity Method Investment [Line Items] |  |
Assets, Current | $ 428.5 | $ 430.2
Liabilities, Current | 697.4 | 657.9
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] |  |
Summarized Financial Information of Equity Method Investment [Line Items] |  |
Assets, Current | 381.0 | 389.0
Assets, Noncurrent | 11,348.0 | 11,877.0
Liabilities, Current | 582.0 | 780.0
Liabilities, Noncurrent | $ 4,052.0 | $ 4,077.0

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