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New Accounting Standards (Details) - USD ($) | 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] |  |  |  |  |
Service cost | $ 2,700,000 | $ 2,600,000 | $ 5,500,000 | $ 5,300,000 |
Restricted Cash | 0 |  | 0 |  | $ 0
Net periodic benefit cost | 1,000,000 | 2,000,000 | 2,200,000 | 3,900,000 |
Income tax expense | 6,000,000 | 2,900,000 | 18,500,000 | 5,100,000 |
Accounting Standards Update 2016-09 [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Income tax expense | 3,400,000 | 9,600,000 | 5,500,000 | 25,500,000 |
Accounting Standards Update 2017-07 [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net benefit cost components other than service cost | 1,700,000 | $ 600,000 | 3,300,000 | $ 1,400,000 |
Accounting Standards Update 2016-02 [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Operating leases, Future minimum payments due | $ 71,300,000 |  | $ 71,300,000 |  | $ 79,100,000

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