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Accounting Policies (Accounting Pronouncements) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Impact of new accounting principle on prior period operating income | $ 94.9 |  | $ (73.7) | $ 287.4 | $ 52.5
Unfavorable impact on pre-tax operating results | $ (62.5) |  | 121.3 | $ (208.5) | 86.9
Accounting Standards Update 2017-07 [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Impact of new accounting principle on prior period operating income |  |  | $ 13.6 |  | $ 40.9
Unfavorable impact on pre-tax operating results |  | $ 5.4 |  |  |

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