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Business Segment Reporting - Schedule of Segment Reporting Information (Footnote) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Severance expense	$ 0.9
Intersegment Eliminations
Segment Reporting Information [Line Items]
Gains on derivatives				$ 7.8
Corporate and Other
Segment Reporting Information [Line Items]
Severance expense	$ 1.0	$ (0.1)		$ 2.6	$ 19.1
Recovery of professional services expense			$ 30.7

X

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Amount of increase in the fair value of derivatives recognized in the income statement.

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Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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