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External Debt and Financing Arrangements - Components of Long-Term Debt (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Long-term debt	$ 2,572.2	$ 2,184.3
Less: current portion		399.7
Long-term debt	2,572.2	1,784.6
Senior Notes [Member]
Debt Instrument [Line Items]
Long-term debt	1,787.2	$ 2,184.3
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term debt	$ 785.0

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
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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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