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Summary Of Significant Accounting Policies Summary of Significant Accounting Policies (Cash Flow, Supplemental Disclosures) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Increase (Decrease) in Restricted Cash |  | $ 0.0 | $ 0.0 |
Net Cash Provided by (Used in) Investing Activities | $ (1,238.3) | (871.8) | (878.2) |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect | 65.5 | 24.5 | 65.6 |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | $ 329.3 | 263.8 | 239.3 | $ 173.7
Restatement Adjustment [Member] |  |  |  |
Increase (Decrease) in Restricted Cash |  | 31.0 | 57.0 |
Net Cash Provided by (Used in) Investing Activities |  | 30.9 | 57.3 |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect |  | 30.9 | 57.3 |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents |  | 255.6 | 224.7 | 167.4
Previously Reported [Member] |  |  |  |
Increase (Decrease) in Restricted Cash |  | (31.0) | (57.0) |
Net Cash Provided by (Used in) Investing Activities |  | (902.7) | (935.5) |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect |  | (6.4) | 8.3 |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents |  | $ 8.2 | $ 14.6 | $ 6.3

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