Recapitalization - Additional Information (Detail) - 2018 Recapitalization [Member] - USD ($) $ in Millions		6 Months Ended
Apr. 24, 2018	Jun. 17, 2018
2018 Notes [Member]
Debt Instrument [Line Items]
Scheduled principal payments in year 2018		$ 4.1
Scheduled principal payments in year 2019		8.3
Scheduled principal payments in year 2020		8.3
Scheduled principal payments in year 2021		8.3
Scheduled principal payments in year 2022		8.3
Scheduled principal payments in year 2023		8.3
Scheduled principal payments in year 2024		8.3
Scheduled principal payments in year 2025		401.4
Scheduled principal payments in year 2026		4.0
Scheduled principal payments in year 2027		366.0
Gross proceeds from the issuance of debt		825.0
Debt issuance costs		8.2
2018 A-2-I Notes [Member]
Debt Instrument [Line Items]
Debt instrument face amount	$ 425.0
Debt instrument, stated percentage	4.116%
Debt instrument, term	7 years 6 months
2018 A-2-II Notes [Member]
Debt Instrument [Line Items]
Debt instrument face amount	$ 400.0
Debt instrument, stated percentage	4.328%
Debt instrument, term	9 years 3 months
2015 Five Year Fixed Rate Notes [Member]
Debt Instrument [Line Items]
Repayment of principal and interest		490.1
Remaining unamortized debt issuance costs expensed by company		$ 3.2

Long term debt maturities repayments of principal in year eight.

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Long term debt maturities repayments of principal in year nine.

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Long term debt maturities repayments of principal in year seven.

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Long term debt maturities repayments of principal in year six.

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Long term debt maturities repayments of principal in year ten.

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Repayments of Long Term Debt and Interest

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Face (par) amount of debt instrument at time of issuance.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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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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