Long-Term Debt - Aggregate Maturities of Long-Term Debt (Detail) $ in Millions	Dec. 31, 2017 USD ($)
Disclosure Longterm Debt Aggregate Maturities Of Long Term Debt [Abstract]
2018	$ 1.6
2019	286.0
2020	4.2
2021	1.8
2022	1.8
2023 and thereafter	756.1
Subtotal	1,051.5
Less amounts representing interest on capital leases, original issue discount and debt issuance costs	8.4
Total long-term debt	$ 1,043.1

Disclosure longterm debt aggregate maturities of long term debt.

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- Definition

Amounts included in gross payments under long-term debt and capital leases representing interest on capital leases and discount on other debt obligations.

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Includes capital lease obligations.

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- Definition

Gross amount of long-term debt and capital lease obligation, including interest on capital leases and discount on other debt obligations.

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- Definition

Gross amount of long-term debt and capital lease obligation maturing after the fifth fiscal year following the latest fiscal year, including interest on capital leases and discount on other debt obligations.

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- Definition

Gross amount of long-term debt and capital lease obligation maturing during the next fiscal year following the latest fiscal year, including interest on capital leases and discount on other debt obligations.

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- Definition

Gross amount of long-term debt and capital lease obligation maturing during the fifth fiscal year following the latest fiscal year, including interest on capital leases and discount on other debt obligations.

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- Definition

Gross amount of long-term debt and capital lease obligation maturing during the fourth fiscal year following the latest fiscal year, including interest on capital leases and discount on other debt obligations.

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- Definition

Gross amount of long-term debt and capital lease obligation maturing during the third fiscal year following the latest fiscal year, including interest on capital leases and discount on other debt obligations.

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- Definition

Gross amount of long-term debt and capital lease obligation maturing during the second fiscal year following the latest fiscal year, including interest on capital leases and discount on other debt obligations.

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