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Summary of Accounting Policies - New Accounting Standards (Details) - USD ($) $ in Millions	12 Months Ended	24 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
Retained Earnings | Accounting Standards Update 2018-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification due to adoption of accounting standard	$ 6.5
Other Nonoperating Income (Expense) | Accounting Standards Update 2017-07
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification due to adoption of accounting standard		$ (2.4)
Forecast | Accounting Standards Update 2018-11
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
ROU assets			$ 55.0
Lease liabilities			$ 65.0

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