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Basis of Presentation (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 2,537.6 | $ 2,165.2 | $ 4,545.1 | $ 3,792.8 |
Assets | 8,024.1 |  | 8,024.1 |  | $ 7,971.7
Cumulative effect of new accounting principle in period of adoption | 0.4 |  | 0.4 |  |
Retained Earnings [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption | 0.4 |  | 0.4 |  |
Accounting Standards Update 2017-07 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income | 0.1 |  |  |  |
Wholly Owned Subsidiary in Argentina [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  | 49.2 |  |
Assets | $ 118.8 |  | $ 118.8 |  |

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