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New Accounting Standards (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Income tax expense (benefit) | $ 41,400,000 | $ 80,900,000 | $ 54,400,000 |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | 4,100,000 | 7,300,000 |  |
Defined Benefit Plan, Service Cost | 10,800,000 | 10,400,000 |  |
Restricted cash |  | 0 |  | $ 0
Operating leases, future minimum payments due | 81,500,000 |  |  |
Accounting Standards Update 2016-09 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Income tax expense (benefit) | 14,300,000 | 33,100,000 |  |
Accounting Standards Update 2017-07 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Defined Benefit Plan, Other Cost (Credit) | 6,700,000 | 3,100,000 |  |
Accounting Standards Update 2016-02 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Operating leases, future minimum payments due | $ 81,500,000 | $ 79,100,000 |  |

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