External Debt and Financing Arrangements - Components of External Long-Term Debt (Detail) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term debt	$ 2,334.0	$ 1,507.6
Less: current portion	525.0	0.0
Total long-term debt	1,809.0	1,507.6
Senior Unsecured Notes [Member] \| Notes due June 2020 [Member]
Debt Instrument [Line Items]
Long-term debt	399.0	398.3
Senior Unsecured Notes [Member] \| Notes due June 2025 [Member]
Debt Instrument [Line Items]
Long-term debt	495.0	494.3
Senior Unsecured Notes [Member] \| Notes due September 2023 [Member]
Debt Instrument [Line Items]
Long-term debt	595.0
Term Loan [Member]
Debt Instrument [Line Items]
Long-term debt	525.0
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt	$ 320.0	$ 615.0

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

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