The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

New Accounting Pronouncements - Narrative (Detail) - USD ($) $ in Millions	Jun. 30, 2020	Jan. 01, 2020	Dec. 31, 2019
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Cumulative impact of adopting ASU, net of tax	$ (2,409.4)		$ (2,336.8)
Accounting Standards Update 2016-13 \| Cumulative Effect Period of Adoption Adjustment \| Revision of Prior Period Adjustment
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Cumulative impact of adopting ASU, net of tax		$ 0.3