Investment in Unconsolidated Affiliate Summarized Balance Sheet Information of Equity Method Investment (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
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

Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold or consumed after one year or beyond the normal operating cycle, if longer.

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+ Details

- Definition

Total obligations incurred as part of normal operations that are expected to be paid during the following twelve months or within one business cycle, if longer.

+ References+ Details

- Definition

Amount of obligation due after one year or beyond the normal operating cycle, if longer.

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+ Details