Recently Issued Accounting Standards (Details) - Restatement Adjustment - Accounting Standards Update 2017-07 - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018
Other Income, Net
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of net periodic benefit income	$ (0.2)	$ (0.4)
Selling, General and Administrative Expenses
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of net periodic benefit income	$ 0.2	$ 0.4