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New Accounting Standards Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Apr. 01, 2017
Accounting Standards Update 2018-02 [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
New Accounting Pronouncement, Effect of Adoption | $ 7.9 |
Accounting Standards Update 2017-07 [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
New Accounting Pronouncement, Effect of Adoption |  | $ 1.9
Accounting Standards Update 2017-12 [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
New Accounting Pronouncement, Effect of Adoption | $ 0.2 |

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