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New Accounting Standards (Detail) - Accounting Standards Update 2016-02 - Forecast
$ in Millions
Jan. 01, 2019
USD ($)
Minimum  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Right-of-use asset $ 145.0
Lease liability 210.0
Maximum  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Right-of-use asset 155.0
Lease liability $ 220.0