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Employee Benefit Plans (Narrative) (Detail) - USD ($) $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Defined benefit pension plans and defined benefit postretirement plans disclosure [Abstract]
Cash contributions for pension settlement			$ 84.8
Defined benefit plan, settlements benefit obligation			66.3
Defined benefit plan, settlements plan assets			$ 127.2
Contribution for pension obligation	$ 34.0
Defined benefit plan, pension expense		$ 159.0

Amount of plan assets that relate to an irrevocable action that relieves the employer, or plan, of primary responsibility for a benefit obligation and eliminates risks related to the obligation and the assets used to effect settlement. Includes, but is not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified pension benefits and purchasing annuity contracts to cover vested benefits.

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