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Debt - Schedule of Debt Obligations (Detail) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Total debt	$ 680.0	$ 1,132.3	$ 1,158.2
Less unamortized discount on Term Debt	1.7	0.9	1.1
Less unamortized debt issuance costs on Senior Notes and Term Debt	6.5	11.6	15.0
Less current portion of long-term debt	6.8		2.3
Long-term debt, less current portion	665.0	1,119.8	1,139.8
Term Debt [Member]
Debt Instrument [Line Items]
Total debt	$ 680.0	657.3	683.2
Senior Notes [Member]
Debt Instrument [Line Items]
Total debt		$ 475.0	$ 475.0

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Amount, after accumulated amortization, of debt discount.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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