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Operations and Summary of Significant Accounting Policies Operations and Summary of Significant Accounting Policies - Basis of Presentation and Consolidation (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Cash	$ 412.3	$ 290.5	$ 317.0
Cash Equivalents, at Carrying Value	17.3	35.6	50.7
Restricted Cash	3.2	0.0	0.0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 432.8	$ 326.1	$ 367.7	$ 429.7
Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage	20.00%

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