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Derivatives and Financial Instruments - Recorded Amounts and Estimated Fair Values (Detail) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Derivative [Line Items] |  |
Total debt | $ 1,225.7 |
Recorded Amount |  |
Derivative [Line Items] |  |
Variable rate debt | 135.0 | $ 102.2
Fixed rate debt | 1,090.7 | 690.5
Total debt | 1,225.7 | 792.7
Fair Value |  |
Derivative [Line Items] |  |
Variable rate debt | 135.0 | 102.2
Fixed rate debt | 1,121.7 | 691.8
Total debt | $ 1,256.7 | $ 794.0

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