Taylor took his time, Williamson got moving more briskly, but Taylor accelerated late on to complete his third ODI ton in the last five innings.
Indeed the pair shared a century-plus stand for the  10th time. Only 15 combinations have achieved that and only one pair - South Africa's Hashim Amla and AB de Villiers - average more, 81.96, than Williamson and Taylor's 60.91 when batting together. The South Africans have achieved their marks in 35 innings, the New Zealanders in 38.
In four of their last five ODIs, Williamson and Taylor have compiled century partnerships.
On the recent England tour, at the Oval it was 121 (Williamson 93, Taylor 119 not out), followed by 206 at Southampton (Williamson 118, Taylor 110) and 101 at Trent Bridge (Williamson 90, Taylor 42) before last night's effort.
Williamson eased past Ken Rutherford's ODI run mark to leave only 12 New Zealanders ahead of him.
As New Zealand captain, in 10 ODIs, Williamson has hit 588 runs at 65.6, dwarfing his overall average of 48.16 in 80 games.
There was a brisk contribution from Grant Elliott, 43 off 32 balls as the last 10 overs produced 115.